does total water volume affect how many fish you can get?

i have a 55 gallon tank and a 35 gallon sump plus a 100gallon rated canister filter does that affect how many fish i can out in a tank. JYI i want to get a tropheus murago colony so can i get more tropheus than a standard 55 gal tank with all of my filtration

 

It depends on the fish. If its a fish that needs space to swim or a fish that is territorial than water volume means nothing.

 

Yes and no..(mostly no) There are two elements here. One is the water quality in a smaller total water system can't handle as much as someone that has a larger system. The waste is diluted among more gallons so of course that is a bonus. But when people speak of how many fish can be in a certain size tank they are usually referring to the display tank only. Fish need to have personal space.

 

Didn't you have another post that mentioned you had just acquired a 75 gal. tank for the tropheus moragos? From what I've read, you should keep 1 male and 6-7 females, I guess that would equal your school. I think you could get away with it in a 55, but remember, they get to about 5" as adults, so that will quite a few fish for that sized tank.