Hay guys im still designing up my 60l nano but I have gone for a external canister with 2 trays full of carbon and one of phos-zorb and one of bio balls sound right?
Im having two overflow holes drilled in the top of the tank for a sump and having the canister pump it back from the sump just wondering what size should the over flow holes be? Im goind to partition the sump into 3 parts one for the skimmer, one for some live rock rubble, and the last for the return and the heater, would i be safe to run another heater in the tank its self? Bearing in mind the sump is about 30ish L, also if I made a cabinet to house both the sump and external would the external overheat the sump? any advice one what else to do