I have 1100g bp's in V-18 tubs (~8qt) and they love it. I generally don't move them over to the 41qt tubs until they're over 1100g and getting close to breeding size. I just moved my 1100g Pied girl from a V-18 to a V-70, 41qt tub and I'm hoping it doesn't throw her off feeding too long. Try a smaller tub for kicks.