Not taking anything away at all, I said the same thing in this thread on post 17.

I have no plans for filtering currently, I used to have problems with the variflow valves, but I switched to the reptile basic ones which use a spring and havn't had a failure yet. The tank connectors have a built in screen which gets dust and what not. I might make it a habit to clean everything once in a while incase of any build up like that.

Worst case scenario, I have issues and I add a filter of some sort lol.