I'm thinking about making a sump for my 40 breeder, but I already have a silent canister filter that works just fine. I would like to add the sump for more bio filtration, and I have axolotl's in my 40 breeder so I could use a cheap pump with low flow. Problem is the tank is in my bedroom and it needs to be silent. I was thinking about buying a premade overflow, but I'm not sure if this would insure the sump would be compeltly silent like the canister filter. If I go through with buying an overflow, and make a sump will it be silent, or will I spend hours and hours trying to make it silent to no avail?
