Good luck....
As a degreed "fish guy" I usually just throw fish in a tank. I have a South American cyclid tank (55 gal long) and I have a 55 gal tall which I use for fish that I catch with my job and culls from the other tank. I have some of rocks similar to the Texas holey rock, I picked out of one of my grad school research sites.
One bit of advice in relation to your kids....put the food out of their reach. Otherwise they will feed the fish quite frequently or use the entire bottle.
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