Well it seems that way anyway. This is only 1/4 of my 6.6 gallon Fluval tank. I've only had these MTS since late July. So far I have shipped a few packages to people to thin them out and got 1 Assassin to help keep the population under control. I don't feed them but maybe one small algae tablet once a month but they sure do breed. Must be my "Love shack" waters. BTW - I started with 7 of these guys in July. I must have over 300 now! These are the ones you see in the day - at night its much worse!