Rskillz;628279 wrote: This could be due to a litany of different issues. Your best bet would be to test all of your general paramaters (nitrate, calcium, magnesium, salinity, temperature) and post those, as that would help us troubleshoot what the problem could be. Generally speaking, most problems arise due to high levels of waste and nitrates/nutrients, improper lighting, and improper flow.
Post all of the possible info about your system, equipment, and parameters and you will get a lot more dialed-in response.