I have 5 Blue Dempsey's a few lifalili two S. Angelicus and a pleco they did fine in a 75 for about 5 months now they need more room the largest is the bully (only towards other EBJD)but once removed the second to largest is the bully and so on so I put the 2 largest in a 65tall but now I have the same problem in 2 tanks I cannot provide 5 set ups for my 5 Dempsey's I didn't think the bd where as aggressive as jd any suggestions