I can OWN "HARD CORE FREAK"
I like that!
I would not worry about your IBC's for what you are doing.
IBC's are generally square tanks with no sharp right angles and that is where stuff builds up. You should be able to put in a center drain, being this small with adequate depth and introduce your water back in by diffusing it along two opposing sides. Should keep it pretty clean in the tank, but you'll have to tweak how you introduce the input.
I've been trying to find a couple IBC's around here, but they have all had industrial waste in them and the prices are outrageous. Hell, if there is still a quart left in them, it could cost hundreds to have it cleaned along with all the lab work to certify it.
