Least Bioload?

Small one's like cfc has said, noen tetra's.
 
When all other things are equal (temp, oxygen content of water, etc.) the fish with the smallest mass will produce the least waste. There are other things to consider, such as the fish's lifestyle -- a zebra danio (much more active) will produce more waste than a similarly sized cory catfish (that spends a significant amount of time sitting on the bottom). But, for the quick, big picture: fish mass -- which would be close to fish volume -- is the best guess.
 
Not true as fish that eat plant or similar foods have more waste. It's harder to break down stiff-celled food than it is animal cells. Typically they must eat more food as a result as well to gain more food.
 
Algea eaters may have no effect when it comes to bringing food into the system but they change beneficial but ugly algea into harmful but not so ugly poo.

Fish mass and fish volume are directly proportional, fish all need to wieght the same as the water so they don't sink or float too much, Small lazy fish produce the least amount of waste, unless they are small fish that are growing, and most important of all, the biggest source of waste in uneaten food.
 
True, the alage eater would keep more nitrogen in the water, but does not add any nitrogen to the tank in the long run. There is only one input of nitrogen and two outputs; food and water changes/plant growth and removal. Just because a fish is a messy eater does not make it magically add nitrogen to the tank as a whole; it just liberates a lot of it from the plants.

Edit: I said theoretically; of course an alage eater will have a slight impact on water quality.
 

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