Originally Posted by podman1973
i have only been doing 20% once a month my numbers stay at 0 even at a month but i still do one
That's probably the main source of your problems right there... in my opinion, 20% every two weeks is a bare minimum. Not only are you getting rid of excess nutrients, you're replacing trace elements and keeping your pH stable.
The thing with cyano
, and other nuisance algaes, is that they will suck up nitrates and phosphates as quick as you can put them in your tank. Very often, people will measure "perfect" water conditions while battling cyano
, but the very fact that its there means it's feeding off something.
It probably wouldn't hurt to run some carbon and a phosphate remover (GFO
or granulated ferric oxide) in a media bag somewhere that gets decent flow (cannister filter, sump, hang on back filter, etc) for a while if you're not already, in addition to more frequent water changes. That, and sucking the cyano
out with a siphon hose - and taking some sand with it - should really put a dent in it.