Hi antipofish thanks ,sorry here is the current spec : rena xp1 filter , rena inline heater , tank is 65ltr 60x30x45 ish cm substrate is John innes potting soil covered with 2mm gravel , I have some more substrate to add I know it's a really good quality one but no longer have the packaging So I can't name it! Not much help I know! My aim is to grow a carpet of some sort with other plants in the mid to back part of the tank. I realise the heater/return may have to change as the grills are to big to use with shrimp that's why I have put some sponge over it .