+2 drop the fluval. you can syphon out a bit at a time but it takes time to go away i would consider running some carbon or a uv sterilizer. if your going to remove your fish and corals it leaves you a good oppurtunity to do a very large water change,cut your lights, move around rock as the problem you have you may not see because your looking at the whole picture.are you running a sump??? like someone said post your exact tank details right from parameters to livestock to when they were added and any meds or additives you have used. you said you get your water from an lfs is this store trusted?? hope this helps some times its hard trying to find the cause of problems when our water checks perfect
