Sorry i left this out in my previous reply.J-P wrote:Just a quick Q: why no sand in the tank? That is an excellent source of bio filtration.
I was actually thinking of substrate.
Why no substrate is because when they were transfered from my pond to my house tank i wanted to make sure there aren't any other foreign contaminant. If you know what i mean.
I can look at their belly through their own reflection easily. (of any change in colour or disease)
Siphon out waste and look at the coloration easily too.