should i use a regular carbon filter or another way
Do you have a sump? If so I would put a filter sock on the drain & a bag of carbon. If hot, you could run a hang on filter w/ just the carbon for a few.
should i use a regular carbon filter or another way
they have no problems of phosphates?
I wouldn't run a tank without ro/di.
All other methods are like"slamming the door after the horses already escaped".
In other words you'll find yourself treating for stuff that should have never made it in the tank in the first place.JMO