90-Gallon Low-Tech Nature Aquascape (Beginner)
A 90-gallon Nature Aquarium — a landscape rather than a display, built around one off-centre focal mass with the planting stepping away from it. It is a proper display tank with room to build depth. No CO2 and no dosing regime — slower to fill in, far more forgiving, and cheaper to run. 7 plant species, Manzanita Wood and Dragon Stone, and 5 livestock groups checked against each other for compatibility — every quantity below sized to 90 gallons and every plant chosen for a beginner.
Generate this exact design in the studio →
More than a design — your whole aquarium, handled
Everything below is generated for this 90-gallon Nature build — 7 plants, 5 livestock groups, and gear sized to 90 gallons. The studio does the same for your tank, free.
Hardscape — what to buy and how to place it
Manzanita Wood is pale, hard and finely branched, dividing again and again into thin twig ends. Manzanita releases only light tannins, so the water stays clear rather than going the colour of tea. It floats, and it will keep floating for two to six weeks. Either boil it, or weight it down with a stone until it waterlogs — this is the most common first-week surprise with manzanita. A thin white biofilm on the fresh wood is normal and passes on its own.
Dragon Stone is warm ochre and deeply pitted, full of hollows and honeycombed pockets. Dragon Stone is baked clay and chemically inert, so it will not move your pH or hardness in either direction. Rinse and scrub it hard before it goes in — dry Ohko sheds a fine clay dust that will cloud the water for days. The hollows are planting pockets: press moss or a small epiphyte into them and the stone disappears into the scape as it grows.
Pairing Manzanita Wood with Dragon Stone works because they do different jobs: the stone anchors the base and holds your substrate contour, and the wood carries the height and the movement above it. Let them touch — wood resting into a stone, sand banked against both — so the two read as one structure rather than two separate features sharing a tank.
Nature Aquarium composition runs on a single focal mass placed off-centre — roughly a third of the way across — with everything else stepping down and away from it. Height at one end, open substrate at the other, and nothing of equal weight on both sides.
Substrate
Aqua soil or capped organic base, capped with fine natural gravel/sand cap, built to about 2.5–3.5" and sloped higher at the back. A nutrient base keeps low-tech plants fed; cap with fine gravel. Slope higher at the back.
A capped nutrient base is the engine of a low-tech tank, so the one rule is to leave it alone. Vacuum the cap, never the layer beneath it — driving a siphon down into the base releases everything it has been quietly storing and can gas a tank in an afternoon.
Because this plan carpets the foreground, keep the front of the substrate shallow and level — around an inch is plenty — and save the depth for the back. Carpets are planted into a flat bed in small clumps a couple of centimetres apart, and they spread sideways to meet; planting them dense enough to look finished on day one wastes plants and traps debris.
Spiral Cryptocoryne is a root feeder rather than a water-column feeder, so it wants depth and a root tab more than it wants dosing. Give that part of the bed the extra depth.
At 90 gallons the substrate is a real purchase, not an afterthought — budget for it early and buy it all at once, because a bed topped up later with a different bag rarely matches.
Plant list & placement
Plant back to front, into damp substrate with the tank only part-filled — it is far easier than fighting buoyancy in a full tank. Onion Plant is the tallest thing in this plan at around 24", so it sets your back row and everything else steps down in front of it.
Tiger Lotus (Green) is the fast grower here — green-leafed Tiger Lotus. Bulb plant producing large dramatic round leaves. Trim surface leaves regularly to keep underwater growth. Adds tropical drama to a layout. Expect to be cutting it every two or three weeks once it establishes. Top the stems, replant the healthy tops in the same group and discard the old bases; a stem bed replanted from tops stays dense, while one left to grow on goes bare at the bottom.
Bucephalandra pygmaea and Bucephalandra 'Lamandau' are epiphytes and must never be buried. Tie or glue the rhizome onto your hardscape and leave it fully exposed — a buried rhizome rots, and it is the single most common way a beginner loses an Anubias or a Java fern. Only the roots may touch the substrate.
Every plant here is a hardy, forgiving species. None of them need CO2 to survive, and all of them recover from being neglected for a fortnight — which is the right way to start, because the tank should be teaching you the routine rather than punishing you for missing it.
Stocking
This stocking is built to spread through the tank rather than crowd one layer: Black Neon Tetra and Harlequin Rasbora share the open middle water and Bolivian Ram and Bristlenose Pleco share the floor. A tank where every fish occupies the same band looks half-empty even when it is fully stocked, and the fish themselves compete more.
Keep Black Neon Tetra in 6 or more and Harlequin Rasbora in 8 or more. These are not decorative numbers — a shoaling fish kept in threes spends its life stressed, colours down and hides, and people then conclude the species is dull. The counts in the list above are already scaled to this tank.
Bolivian Ram is the centrepiece. Hardier, cooler-tolerant alternative to the German ram; great for beginners to cichlids.
Red Racer Nerite Snail is the clean-up crew, and in a planted tank it earns its place — grazing biofilm and soft algae off the hardscape and leaves faster than you can. Add it last, once the tank has some algae to eat, and drip-acclimatise rather than dumping the bag in.
- Black Neon Tetra — Keep Black Neon Tetra in a group of at least 6 — kept in ones or twos they get stressed, shy, and nippy.
- Bolivian Ram — Bolivian Ram is territorial/solitary — best kept as a single specimen.
- Bristlenose Pleco — Bristlenose Pleco is territorial/solitary — best kept as a single specimen.
- Harlequin Rasbora — Keep Harlequin Rasbora in a group of at least 6 — kept in ones or twos they get stressed, shy, and nippy.
The largest fish here is roughly 3.3× the length of the smallest, which is the point at which size alone starts to matter — that gap was checked against mouth size and feeding behaviour, not just temperament. Every pairing was run through Skapelab’s compatibility engine and anything returning even a caution was swapped out rather than published. Check any substitution you make there before you buy.
Equipment
| Category | Recommendation | Notes |
|---|---|---|
| Filtration | Eheim Professionel 4+ 600 | ~$380–470 |
| Lighting | Finnex Stingray 2 48" | ~$46–68 |
| Heating | Oase BioMaster Thermo 600 (integrated) | Included with Oase BioMaster Thermo 600 (~$360–450) |
| Substrate | CaribSea Super Naturals Torpedo Beach Sand | ~$18–28 |
| Fertilizer | Seachem Flourish Comprehensive 250ml | ~$8–14 |
| Testkit | API Freshwater Master Test Kit | ~$28–42 |
| Water treatment | Seachem Prime 500ml | ~$12–20 |
| Bacteria | Seachem Stability 250ml | ~$8–14 |
What the first two months look like
| Week 1 | Hardscape in, planted, filled and running with no livestock. Start the photoperiod short — six hours is plenty — because the plants are not yet growing fast enough to use more, and the surplus goes to algae. Your Manzanita Wood will still be trying to float, so keep it weighted or clipped down until it waterlogs. |
| Weeks 2–4 | Cycling, and the ugly phase. Brown diatom dust on the glass and hardscape is normal in a new tank and passes on its own once silicates are used up. Some plants will melt back and regrow in their submersed form — that is conversion, not death, so trim the mush and leave the roots. Do not stock until ammonia and nitrite both read zero. |
| Weeks 4–6 | Stocking begins, a few animals at a time with a fortnight and a water test between additions. The first real trim happens somewhere in here, and the tank stops looking newly planted. |
| Months 2–3 | The scape fills in and the routine settles into the schedule below. On a tank this size, get the maintenance rhythm fixed now — a large tank is very stable until it is not, and by then it is a large problem. |
Care schedule
| Daily | Feed lightly — as much as they clear in a minute or two — and take ten seconds to count heads and look at the plants. |
| Weekly | 27% water change — about 24 gallons — using a tap-fed water changer — at this volume buckets stop being realistic. Wipe the glass, vacuum the open substrate only, and dose a light all-in-one fertiliser. Trimming is occasional rather than weekly at this growth rate. |
| Monthly | Rinse filter media in old tank water — never under the tap, which kills the bacteria colony you spent six weeks growing. Test KH, GH, pH and nitrate. On a tank this size also check the seals and the stand for damp, because a slow leak here is a floor problem, not a tank problem. |
| Every few months | Thin the slow growers back hard once or twice a year, divide anything that has outgrown its spot, and top up root tabs around the heavy feeders. |
Make it yours
This is a starting point. Open it in the studio to swap plants, resize to your tank, and get a hand-illustrated render, placement diagram, and shopping list — free.
Start this build →