My specs:
29 gal planted
1 powerhead pointed down toward gravel to keep water moving (I put this in after the first 3 got sick)
ecocomplete substrate
2 20 watt aqua-glo bulbs
driftwood
deco rock
6 rainbows
2 otos
temp: around 77
water parameters: amm-0; nitrite-0; nitrate- around 10; ph- around 7.8 ...