Thanks for the help. I've been trying to read up before I go, so much info out there.

It looks like if I do the bigger gravel I need to give them a dish so they don't lose their food in it. That seems easy enough.

I still can't figure out if it should have a filter or just do water changes.

I will see if they have a lid for the 20gal. The 10gal I have won't work because it's a cheesy little bow front thing and I can't properly seal the top.

I'm going to guess they tell you not to feed it more because then the tank won't be in balance. Yeah, not worth it to me to starve the poor things so they don't need to be cleaned as often.