It's good to do a full res change every 10 day's at least.

If you want a quit fan that works great look for a vortex type of fan. There are a few companies that make a centrifuge air mover that is what you are looking for. They are expensive but worth the price for quality and how quit they are.
Zandor Reviewed by Zandor on . Hydro go go I am going to start a hydro system. but i have a few questions. 1.) If i use a large bubbler system, how often do i have to do a complete flush of the resevior? 2.)How much noise would a small carbon filter setup make? I am not sure what to use for the fan.. so some advice on which is the best and quitest would be awsome. you guys are awsome! Rating: 5