Hey Jim
Sorry that I didn't reply til now, have been busy with life and water changes, LOL.
Anyways, they are currently in a 35 gal tank in OT. In about a month they will be moved over to a 55. I currently am changing 75 - 100% a day. 25-50% in the morning and 50% in the evening before I head off to work. My largest meal is being fed in the morning (with beefheart) so I do a water change then to remove any uneaten food and waste to avoid it from poluting the water.