I keep all my adults in 28qts all they all seem to be fine. I keep my sub-adults in there too. Basically, hatchlings/babies are in a 6qt until they are about 500gr. Then, they go into a 28qt. If they get adult size and I see they need a bigger bin, then I move them up to a bigger size. Balls actually perfer smaller, enclosed spaces IMO I think that it gives them security. Since balls are private, aquariums (which I first had ONLY because the Pet Stores told me to buy one) are not that good for them. They like their privacy and with aquariums they really don't get that, not to mention that it is more sanitary to keep them in a bin, its easier to clean and move around. That's why the rack system is such a good deal all the way around.
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