Originally Posted by
JohnnyAirtime
I only thin mine out, when it looks really crowded.
Mine is always floating up near the top of the water, so it's not a good gauge of "when" to remove portions. Simply look through it, and when it starts getting too thick or doesn't have room to grow... trim it back to a small baseball sized piece. If it grows that fast... it'll be back to size again very shortly.
The thing is... you need a large "clump" to do it's job. Too small, and it's not removing the bad nutrients from the tank. There's nothing wrong with too much chaeto in your Refugium (Fuge), unless it's starting to turn brown (dying) or water can't flow THROUGH it. So don't thin it out too much... or, your defeating the purpose of having a fuge (with chaeto) in the first place.