L021;3733301; said:Also, I would never tell someone who just got one for their 30 gallon: "You need a 125". They can't plausibly think of that, considering most people think a 50 is huge. 75 may not be optimal for the beast that you raised from 1", but not everyone can get a 125, and 75 is one heck of a lot better than 30, or even 50.
A responsible pet owner would NEVER put one in a 30. If you were a responsible person you would encourage anyone you saw trying to put a common pleco in a 30 to find another home or get a bigger tank for the fish. Doing less than that is promoting animal abuse. If you aren't part of the solution, you ARE part of the problem.
Encouraging a 20+ inch fish to be put into a 50 gallon tank is meeting the needs of the fish keeper, not the needs of the fish. If you can't meet the needs of your pets, find a new home for the pet. Its that simple.