bio balls


New member
From what I have understood, bio-balls, bio-wheels feed nitrates back into the system causing algea issues to develop.

If you are doing a reef tank, my recommendation is to go with live sand and live rock as you main filtering medium. Add a good skimmer. Use a sump/refugium setup and all should work well for you.

I have been here for just over a year and started with a HOB filter and a skimmer/live rock and the the such. Since then I have upgraded lighting, added a sump, and now building a refugium to add into my system in a few days...


Premium Member
I wouldn't use them in a reef setup. They often seem to cause nitrate problems, and they're more maintenance work. Live rock should be able to do all the biological filtration needed.


In Memoriam
Fish can withstand water conditions that coral cant.Ill bet you have high nitrates as this is the bio balls downfall.Nitrates cause little harm to Fish.
<a href=showthread.php?s=&postid=11617987#post11617987 target=_blank>Originally posted</a> by baldomero
been using it in my 90 gall fowlr no problem.


Premium Member
Sometimes, maybe most of the time, bio-balls don't cause any troubles. I don't see the value of them in a reef tank, though.


Premium Member
From what I've been told, the bio balls are a big no no in a reef setup as they can harbor nitrates as others have stated. I was using the bio balls and have not been able to get my nitrates below 10. Normally they stick at 20.

I've just finished removing all my bio balls and have replaced them with LR.

If you're going to do this, just make sure that if your tank is done cycling, that the live rock is cured. If not, you're probably going to get another small cycle...amonia spike. Some Amqeul should handle that. If it's still cycling, you won't need to worry about that.