Originally Posted by
Flower
http:///forum/post/3092738
Sorry but I have used canister filters for 30 years without a single problem. 4 years saltwater and still no issues, it takes less space and it doesn't require drilling any holes. I rinse the media in saltwater to keep th good bacteria...your version of a canister filter would be the same no matter the filter...if you have a filter pad, the water flows through, solids get trapped and the same water returns to the tank. So it isn't sitting in a there to rot, that "rot" as you call it is what breaks down the solids in a normal cycle...all filters do that.
my canister filter also has a nice flowbar so the surface is moved without using a power head, so my power heads can be used to create a nice current where it is more needed.
I don't think they are a "bad" addition to the tank, I think they are a useless one.
Your right in that all filters do that... all canister filters. A protein skimmer removes what it removes from the water column all together, and a sock gets changed out...or SHOULD get changed out at least every 2 days.
You say yourself that the solids get trapped and it breaks down in a normal cycle. Do you remember what the very first part of the cycle is??
It does go through it's cycle, but ammonia is ammonia for at least 3 days before the trites start. You beneficial bacteria is in place to neutralize it asap, but it's still there. For example, when a fish pees, it's ammonia entering the water. The bacteria handles it as quickly as possible, but for 3 days, that little drop is still ammonia.
I do not think they will "hurt" your tank. But I don't think they help either.
As Ophi points out, it is a mechanical filter. And if your diligent in cleaning out the pads, then it won't hurt. But why not let the food fall all the way to the bottum and let the hermits take care of it.