I am going to be ordering a 450 gallon tank, 96"x36"x30". How many rays should i be able to keep in it? I currently have 3 rays, a motoro male, and a male and female aparcio i got from rapps. I also want to put my 4 cichla and my gold oscar in there. Think i could put another ray in? Or is this ok as is or overstocked?