Jim , lots of questions
They are Wild Colombian from a dealer in the UK called Oddball Express .
There are 5 2 males and 3 females . The males are around 8" and the females about 6" .
They are currently in a 6 x 20 x 20 (480lts). They have pure RO water but my PH never really drops to below 7.0 . PPM is 160 which is roughly 1-2 GH .
They have lots of greens and chucked in prawns etc . The males are aggressive towards the females but nothing to hurtful