Hi am new to this site and keeping fish but have had a Aqua One 340 thought i would start small and see how it goes. Having had the tank three months now the fish I have added are doing well I have Neon and Pristella Tetras and some Harlequins. I would like to add a couple of medium fish but stop there for the time being due to the size of the tank would just like some suggestions of what to get to keep the peace before a larger tank maybe six months down the line.