75-Gallon High-Tech Dutch Aquascape (Advanced)
A 75-gallon Dutch aquascape — no rock, no wood, and all of the structure carried by terraced rows of contrasting plants. It is a proper display tank with room to build depth. Pressurised CO2, active soil and real light — faster growth, more colour, and a tank that needs you every week. 10 plant species, and 5 livestock groups checked against each other for compatibility — every quantity below sized to 75 gallons and every plant chosen for an advanced.
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Everything below is generated for this 75-gallon Dutch build — 10 plants, 5 livestock groups, and gear sized to 75 gallons. The studio does the same for your tank, free.
Layout — a Dutch tank has no hardscape
Contrast between neighbouring groups is the whole design. Put fine leaves beside broad ones and red beside green, and keep each group as a solid block rather than mixing species together — a Dutch tank fails when the rows blur into each other.Substrate
Aqua soil (e.g. ADA Amazonia / UNS Controsoil), built to about 3–4" and sloped higher at the back. Active soil buffers soft, slightly acidic water and feeds roots. Slope higher at the back for depth.
Fresh aqua soil leaches ammonia for the first one to three weeks. That is normal and it is also why you do not stock a high-tech tank early: run it, change a good volume of water two or three times in that first fortnight, and wait for ammonia and nitrite to read zero before any livestock goes in.
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.
Cryptocoryne 'Flamingo' 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 75 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. Persicaria sp. 'Sao Paulo' is the tallest thing in this plan at around 16", so it sets your back row and everything else steps down in front of it.
Persicaria sp. 'Sao Paulo' is the fast grower here — pink-toned narrow-leaf stem with white flowers; tall Dutch plant. Expect to be cutting it weekly 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.
Red Root Floater sits on the surface, which does two useful things and one inconvenient one: it shades the tank, which calms most fish and suppresses algae, and it strips nitrate fast — but it also cuts the light reaching everything below, so thin it out by hand whenever it covers more than about half the surface.
Group the stems rather than spacing them out. Persicaria sp. 'Sao Paulo', Mermaid Weed and Rotala 'Blood Red' each want to be planted as a block of stems an inch or so apart, cut to slightly different heights so the group fills in with a rounded top instead of a flat hedge.
Cryptocoryne 'Flamingo' is the demanding species in this plan, which is why it appears at advanced level: it needs stable CO2, consistent dosing and real light, and will show you the moment any of the three slips.
Stocking
This stocking is built to spread through the tank rather than crowd one layer: Chili Rasbora and Emerald Dwarf Rasbora share the open middle water and Betta (Siamese Fighting Fish) and Pygmy Cory share every level. 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 Chili Rasbora in 8 or more, Pygmy Cory in 8 or more and Emerald Dwarf 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.
Betta (Siamese Fighting Fish) is the centrepiece, and being semi-aggressive it sets the limit on what else can go in. Solo centerpiece; never house two males. Calm tankmates only, no fin-nippers.
Olive 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.
- Chili Rasbora — Keep Chili Rasbora in a group of at least 8 — kept in ones or twos they get stressed, shy, and nippy.
- Betta (Siamese Fighting Fish) — Keep only ONE male Betta — males fight to the death. One male with several females works only in a large, heavily planted tank.
- Pygmy Cory — Keep Pygmy Cory in a group of at least 8 — kept in ones or twos they get stressed, shy, and nippy.
- Emerald Dwarf Rasbora — Keep Emerald Dwarf Rasbora in a group of at least 8 — kept in ones or twos they get stressed, shy, and nippy.
Betta (Siamese Fighting Fish) has trailing fins, so the real constraint on this tank is fin-nipping — every other species here was tested against that specifically and anything that has been credibly reported as a nipper was excluded, not merely flagged. 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 | Oase BioMaster Thermo 350 | ~$280–350 |
| Lighting | ADA Solar RGB 60 | ~$570–680 |
| Co2 | GreenLeaf Aquarium GLA Regulator + 20lb Cylinder | ~$400–510 |
| Heating | Oase BioMaster Thermo 600 (integrated) | Included with Oase BioMaster Thermo 600 (~$360–450) |
| Substrate | ADA Aqua Soil Amazonia II 9L + Powder | ~$75–98 |
| Fertilizer | ADA Green Brighty Nitrogen + Step 2 | ~$48–65 |
| 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 | Substrate contoured, rows planted, filled and running with no livestock — nothing to place first here, so the planting IS the layout and it is worth taking time over. CO2 comes on an hour before the lights and off an hour before they go out; aim the drop checker at a green, never yellow. Keep the photoperiod short, around six hours, while the plants root. |
| 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; the fresh soil is also still releasing ammonia, so keep changing water. 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. First topping of the stem groups — cut, replant the tops, and the rows begin to read as rows. |
| 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. Check the drop checker is green before the lights come on. |
| Weekly | 40% water change — about 30 gallons on this tank — using a tap-fed water changer — at this volume buckets stop being realistic. Dose your macros and micros after the change, not before. Wipe the glass and check the CO2 cylinder pressure. |
| 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 | Replace the CO2 diffuser membrane, check the regulator has not crept, and pull the deepest stems for a hard replant. Lights lose output long before they fail — plan on replacing LEDs or bulbs on a schedule, not on symptoms. |
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