This is a discussion on to many fish??? within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; -->
YouTube - 10 Gallon Aquarium i saw this vid on youtube orf a 10g tank it looks like it has tomany fish in wat ...
well it could be bad. if you cant care for them. but what some people would tell you is that as long as you can keep them all healthy, it shouldn't matter that they have a lot. as long as you can keep the water sanitary and in good condition for them it should be fine.
Theoretically you can maintain an aquarium like that but you'll be doing major water changes on a regular basis and even if you do the aquarium is going to be very unstable. One upset in the biofilter and you'll get an ammonia spike in a heartbeat. There's also the issue of whether or not the fish are going to be ok in that crowded of an environment.
I'll third what has been said about the actual health of a tank that overstocked. It's also way to crowded for my tastes. It just looks like...rush hour in Las Vagas. I don't know about everyone else, but a nice tank moderately stocked with compatable fish just is much more appealing to me. That way you can observe the behaviors of each fish. Plus, it seems that they would be a lot happier with more space to swim.