My 55 gallon has been running and cycled for about 1.5 years now, so it's well cycled. However, off and on, more often than not, I've been dealing with hazy water. It's somewhat gray/cloudy. I tried cleaning my filters but that did nothing. I can't figure out what is going on, and my uncycling quarantine tank awaiting some new plants is perfectly clear using the same water so it appears that there's something in the tank causing it to be cloudy. The cloudiness started about the time that I added a stronger air stone, so perhaps it's due to air bubbles in the water? My stocking and plants and such are in my profile, but it's remained pretty constant throughout time, only a few gudgeons added since the haziness began. Thanks for any help!