Hi I have 8x harlequins and 5 x copper harlequins in my tank. I was wondering if I could keeep more than 1 dwarf cichlid in this size tank? I was planning on getting a pair of bolivian rams and maybe a pair of appisto's. My main concern is that the tank could be to small. Also I have a gH of 10 which I think I may need to lower in order to increase the range of fish I could keep, whats the best way of doing this?