OK I missed this the first time. You traded burms for retics because the retics were small?Rainbow was 5 lbs and 7 feet long 6 months ago. Now she is over 10 feet and 28lbs. That is a 3+ feet and 23lbs gain in 6 months. I don't consider that slow. An RTB would have been the way to go if you want something that grows slow or a smaller species.