A few weeks ago I bought a pound(ended up being 60) of goldfish to add to water tanks. We have one old porcelin bathtub and a 100 or so gallon metal stock tank. My question, are the fish sopposed to eat the alge from the sides of the tanks as well? They do a good job of keeping the fallen debris clean, but the sides are no better. Also, will they breed in that setup? I don't need 700 goldfish, but I think watching a group grow up would be neat. We will be adding a few more tanks in the next few months, so I wil be transferring some out to another tank. Didn't expect 60, last time I had 27 in the pound.