5-Gallon Low-Tech Iwagumi Aquascape (Beginner)
A 5-gallon nano Iwagumi: a few stones, one carpet, and a great deal of deliberate empty water. It is a nano tank, where every decision shows. No CO2 and no dosing regime — slower to fill in, far more forgiving, and cheaper to run. 2 plant species, Seiryu Stone, and 2 livestock groups checked against each other for compatibility — every quantity below sized to 5 gallons and every plant chosen for a beginner.
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Everything below is generated for this 5-gallon nano Iwagumi build — 2 plants, 2 livestock groups, and gear sized to 5 gallons. The studio does the same for your tank, free.
Hardscape — what to buy and how to place it
Seiryu Stone is blue-grey, sharply angular, cut through with white calcite veins that run the same way on every piece. Seiryu is a carbonate rock, so it slowly raises KH, GH and pH. That suits most community fish and is worth knowing if you are keeping soft-water species — test your KH a fortnight after filling rather than assuming your tap numbers still apply. Keep every stone’s veins running in the same direction; it is the single thing that makes a group read as one broken rock rather than several unrelated ones.
At 5 gallons, plan on three pieces in clearly unequal sizes. An odd count is easier to compose, and one piece should obviously lead — a group of similar-sized pieces spread evenly across the tank is the most common way a first scape goes flat.
Set the stones before a single plant goes in, and view the tank from where you will actually sit rather than from directly above. Bury a third of each stone so it looks like it grew there instead of being placed there, and angle the faces slightly toward the front glass so light catches them.
Substrate
Aqua soil or capped organic base, capped with fine natural gravel/sand cap, built to about 2–3" 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.
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. Marsilea crenata is the tallest thing in this plan at around 2", so it sets your back row and everything else steps down in front of it.
Nothing in this plan grows quickly, which is the point — it means very little trimming, but it also means the tank takes longer to look established and gives algae a wider opening in the first two months. Keep the light modest until the plants are visibly growing.
Java Moss is an epiphyte 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
At 5 gallons this is deliberately a single-group tank — Chili Rasbora works the open middle water. One species kept properly in numbers is a better-looking tank than three species kept in twos, and in a tank this size it is also the only honest option.
Keep Chili 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.
Snowball Shrimp 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.
- Chili Rasbora — Keep Chili Rasbora in a group of at least 8 — kept in ones or twos they get stressed, shy, and nippy.
- The Java Moss is in this plan for the shrimp, not for the look. Newly hatched Snowball Shrimp are small enough for almost anything to eat, and a thick mat is the only cover fine enough to hide in — it is what decides whether the colony grows or just holds on. Let it fill in before you add fish.
With Snowball Shrimp in the tank the constraint is predation rather than aggression: adult shrimp are safe here, but assume any fish that fits a shrimplet in its mouth will eat one, so give the shrimp moss or dense planting to breed into. 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 | Aquatop SP-80B Sponge Filter | ~$7–12 |
| Lighting | Fluval Nano Aquasky LED | ~$30–42 |
| Heating | Fluval E50 Electronic Heater | ~$28–38 |
| Substrate | Fluval Stratum Substrate 4.4lb | ~$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. |
| 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. In a tank this small there is no margin — one full stocking list added at once is the classic way a nano crashes. The carpet should be visibly running now; resist raising the light to hurry it. |
| Months 2–3 | The scape fills in and the routine settles into the schedule below. Judge the design now rather than on day one; a planted tank is not finished until it has grown into itself. |
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 1 gallons — using a jug and a length of airline. 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. Check for anything the weekly routine keeps missing behind the hardscape. |
| 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.
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