A 60P low-tech that actually stayed clean
Every low-tech tank I kept before this one followed the same arc: clean for two months, hair algae everywhere by month four, rescape by month six. This one — a standard 60×30×36 cm ("60P") — passed the four-month mark clean and stayed there. What changed was not a product. I finally throttled three knobs instead of ten.
The setup
| Item | Value |
|---|---|
| Light | Chihiros A-II, 60% intensity, 6.5 hours/day, timer-controlled |
| Substrate | 2 mm lava gravel capped with 2 cm aqua soil |
| Filtration | Canaan external canister, ~5× volume/hour, lily pipe out |
| CO2 | None |
| Plants | Cryptocoryne wendtii 'Brown', Bucephalandra sp. 'Biblis', Java fern thin leaf, Hydrocotyle tripartita (slow form), Christmas moss |
| Fauna | ~40 ember tetras, 12 otocinclus, neocaridina colony |
Knob one: light, honestly this time
I claimed previous tanks were "low light" while running 100% on a 8-hour timer because the plants looked slow. Slow is the point. At 60% the Hydrocotyle crawls instead of shooting to the surface, the crypts stay wine-red, and — the part nobody warns you about — the tank's algae budget shrinks to nothing. The moss got one trim in twelve weeks. Previously I trimmed weekly. More on picking hardware without a chemistry degree in the LED notes.
Knob two: feeding the fish, not the tank
Ember tetras eat shockingly little. I feed five days a week, one pinch, fast one day. The neos graze the rest. There is no "feeding the plants" beyond two full-column fertilizer doses since July, at half the bottle's recommendation — the schedule is written up in the fertilizing post. The tank runs 3 ppm nitrate between doses and the crypts color up fine.
Knob three: water changes, smaller and warmer
40% weekly changes went to 30% every ten days, temperature-matched within a degree. Crypt melt on change days disappeared, which tells me most of my historic "melt" in this species was osmotic shock from cold tap water, not change frequency. The floater patch that rides the surface gets blamed for more problems than it causes — its real effects are subtler, and mostly good.
What I would tell past me
A low-tech tank is a contract: less light, less food, less interference, in exchange for less of everything — including problems. Every algae outbreak I have ever had started with me breaking one of those three on the way to "just a little more growth."
Week twelve status: glass cleaned by magnet monthly, filter sock rinsed fortnightly, zero algae outside the oldest moss. Buce pushed seven new leaves since June. The embers spawn often enough that the otos must be eating the eggs, which is its own kind of balance.