Is one more hardy than the other? Also my Ph is 7.5, temp 25, tanks mates are sterbai cory's at the moment and eventually a dwarf gourami?? (I recently rehoused my platties as they would not let my cory's eat!!) It's about 16G and only been running for 2 months (has been cycled) Any and all thoughts appreciated, not sure which is best choice for my tank?? I know I would need at least 6 as I want them to be happy and active...not hiding in plants all day! Thanks