I've been running my 3 tanks (30G, 75G, 160G) with gravel and I recently purchased a tiger shovelnose catfish, before reading that they do better with sand or no substrate due to them potentially eating the gravel and not being able to digest it. Will this hurt/kill the fish? Should I change out the gravel for sand or nothing? I'm fully aware that removing the gravel will remove a lot of beneficial bacteria which I don't want to do. Would it be a ridiculous hassle to swap the gravel for sand? Should I slowly remove the gravel over the course of a few weeks/months to go bare bottom?