I have 1 dull eyed royal, and was wondering how many can I keep together? and if I need to worry about sizes or anything else? My current guy/girl is around 5-6" And I've had them for about 1.5 yrs now? I have a 40B that I would like to add some more too as well as the 75 with my current guy. And eventually move them all into something in the 220+ range in the long-run. How many more can I get realistically, if They will co-habitat well? My current guy scavanges for most of his food which I suppliment with sinking wafers, lots of driftwood in the tank, and all the algae that grows that he wants to eat. I was thinking 3 small ones for the 40B that they can grow-up abit in. and maybe 1 or 2 more in the 4" range to go with the current one? Or will this be to many or possible conflicts?