Questions on converting reef tank to freshwater
I have a 300 gallon reef tank that was loved, but after I moved, I am not sure I want to start over again.
Tank is on a steel stand, with a 100 gallon sump underneath. I have return pumps, radions (lights) and heaters.
Still on the fence if I am going reef, salt water FOWLR or planted, but if I go planted, I would probably just want 100-150 cardinal tetras. Heavily planted with a large piece of driftwood and lots of java fern growing on it. Maybe 25 cory cats for some entertainment at the bottom of the tank.
How much does a CO2 system cost for a tank this size?
How big of a CO2 tank do I need to last a month or so?
Can I put the CO2 right next to the return pump?
Do I need a canister filter as well, or could I just put carbon/ammonia remover in reusable bags (in the sump, where the water runs through it)?
Do I need to protect the overflows?
Is there anything other glaring issue I am missing?
I appreciate any thoughts or advice! I have not had a freshwater setup in many years.