I wouldn't keep crays with fish either myself.
Possibly CPO but no other type.
The denisons are being breed by Asian fish farms in mass I believe for a couple years now.
This was agreed on by a couple others upon the advent of PetSmart putting them on sale for $5.99-$7.99!!!
On that and IMO
75g is a minimum for denisons and 5 is a minimum for stocking..
The 60g is atleast 4'?