I have a 8+ inch sailfin pleco in a 55gallon community and a 3 to 4 inch royal pleco in a 125 planted. I give the sailfin zucchini and cucumber every day or and the royal cleans the glass (and does a good job) I do throw in zucchini and cucumber once and a while (yes I know he needs food more often) he also has drift wood. I was wondering could I feed just good old potatos to them?