I have 4 Maxspect XF350CE gyres in my tank. I control them with a Hydros WaveEngine, on "SPS Reef" mode. They are constantly whining. Some more than others. I replaced them about 6 months ago, because of the whining, and they were fine for a while. But over time, the whining has come back with the new ones. I clean them about every 3 months using citric acid.
Any suggestions?
Any suggestions?
