Join Date: Dec 2012
Location: Lehigh Valley, PA
Sounds like you have a great plan for a larger tank than 25l. 25g and you'd be fine with lots of extra room
If you compromise a little, and not go for a specific rio negro biotope, rather just a blackwater setup, you can get a nice sized school of the smaller tetras, like ember tetras. Or pencilfish. If it were my tank, I'd rather see a lot of one species, than a handful of two. I've always had better succes with tetras in as large a group as possible. They are just happier.
That being said, i tend to overstock, as far as bioload, so a well managed tank can handle more fish than many guides will tell you. In a tank as small as yours, with your fish choices, I wouldn't be worried as much about the bioload as just crowding the fish. What are the dimensions of your tank?
Another thing to keep in mind, a leaf litter tank adds a lot of decaying organic matter. So nitrate export is a challenge. Your idea of water lettuce is a good start. Although with the length the roots can get, they may end up dominating the tank. Have your though about smaller floaters?
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