I have one of both coexisting in my 75 gallon tank. Some differences i have noticed is that one got both within a week of each other and within a 1/4 of an inch when i got them but Blackie (
RTBS) is much longer and quite a bit "fatter" while Whitie (The Albino) is much skinnier and lagging about about an inch or two behind Blackie. Also for a week or so when i fist got them they coexisted quite well in an 10 gallon but they were antisocial and hid within my log but as soon as the move the 75 gallon (which was quick b/c my tank cycled within a day(3-4 inch thick bed of cycled gravel)) they were all over the place. Blackie was out more than Whitie (became nocturnal) but as soon as I rearranged my scenery some and added more obstacles Whitie finally staked out his own territory. So in summary anyone looking to get a RTBS make sure that you get at least a 30 gallon if you actually want to see them and also if wanting ore than one have i would say at least a 55 gallon b/c they stay mainly on the bottom for me so it is more about the surface area not the amount of water. Also both of mine are quite picky eaters I never see them eat the food i put in there other than the nibble on the algae wafer they mostly just clean off the rocks and scenery.
Others experiences?
Anyone else keeping more than one in a tank?