I would say it's a bad thing because the snails eat the same thing as the catfish. It may also be difficult to get rid of the snails, depending upon which snail species you get.

- Erik

We need to paint the ceiling in the fish room using a poisonous paint.The fish tank contains a couple of Panaque nigrolineatus and some less important non-catfish. Do I need to move the fish during the painting or will it be sufficient with large daily water changes? Will filtration with activated ...