Canister Filter in Reef Tanks, why not?

[mach1ray]

I've read some say not to use one in my reef tank but I see some keep one in use. I have a Fluval 500 in mine with carbon, phosban and the cylinder media that comes with it. On top of all the trays I added a sheet of filtration cloth to slow down the flow and keep the water crystal clear.
I also run 4 power heads, 2 of which are coralife and have the extension piece that contain a sleeve to catch debree and in it I can put carbon or phosban. I currently put phosban in it due to my issue with red turf algae (btw, doesn't seem to phase the algae issue).
What is the reason I should not use the Fluval and in what instances is it ok for run it for a period of time? Also, are the attachments on the power head a problem too?
I just think the skimmer is not enough and don't trust sumps due to possible over flow and damage to very expensive hard wood floors (which I am still paying for after 1 year

).

 

[mr. limpid]

They only reasons is that carbon removes trace elements, which are need by all corals. Which means you need to test for them, so you can add them back in. As for canisters in general if not maintained they will release nitrates back into your tank. So just make sure to clean or replace the pre filter media and the carbon on a regular schedule.