Okay. My suggestion is to move them to a 5 gal bucket with some chaeto. Keep rigid airline with light flow. You will need phyto. Keep water tinted green.
For phyto try culturing your own as it gets expensive. Very easy to do.
Happy to help with the process of you want to PM me I will five you my mobile number and will help you out.
Last comment. Make sure if he is eating frozen prepared foods- keep target feeding him and don't let him get to the point where he is only eating pods.