Fish Holding system ideas please

[condiman]

Well I got into my new shop and I am loving it but I want to come up with an economical way to setup my holding tanks for the fish. I run a service company and I want to also have it available for local hobbiests to come in by appt. to buy stuff as well. I keep thinking of plywood setups. What do you all think? Also if you had pics that would be kewl as well.