SPS question

[Snappy]

Originally Posted by Ya Dude

also if you dont use Zeo theres no need to test for K
zeoliths are the cause of potassium depletion

I don't disagree that the zeolite depletes potasium but corals do use it and if you don't replenish it you may have problems in a well stocked sps tank. I don't run zeo but still dose with Kbalance daily and I think it makes quite a difference in the overall health of my corals. I also dose iodine, strontium and several other trace elements.
Colin, there are so many variables to what the cause could be, whether it's one thing or a bunch combined it's hard for us to tell here. I would give some hard thought as to what may have changed in your routine, etc. If that isn't the case I would test as many parameters as possible and see where that takes you. How old are the cartridges for your RO and when was the membrane last changed? Also why are you running carbon 24/7? Do you have a lot of softies and LPS in your system? If not the carbon is probably just pulling out some trace elements, etc. If you are skimming heavy I doubt you need the rowaphos unless you're seeing an algae build up. It's not always easy to get the right balance but sps still needs some nutrients to thrive.