Planted Tank Enthusiast
Join Date: Sep 2010
Location: Southern California (LA)
A lot more than you think in a planted tank.
I have a 20 G with the varying amounts of the following fish/animals. The tank has 0 problems...tested for ammonia, nitrates and nitrites for weeks after introducing each group of fish and tank is handling it well.
African Dwarf Frog
Siamese Algae Eating
The key is to add slowly and see how much each addition stresses your system. You'll be able to notice it, of course, in your ammonia/nitrites/nitrates. So long as you do that, and the fish you pick can actually fit and have adequate space, you're good.
Needless to say, I'm done...won't be adding anything unless I have a loss but so far so good!
I also agree with Riparium..the type of fish matters quite a bit. The gallon/inch is really for the novices of novices. Shrimp are typically not seen as heavy contributors to the bioload. In fact, their presence may do more good than harm by consuming debri and left over food which, if left in the tank, will contribute quite a bit to the bioload as it degrades.