sly
Active Member
I have 390 watts of PC. The 4 of the bulbs are 50/50 and 2 of them are pure actinics. They are about 4 months old. I'll try one of those bags. Whatever is going on, it's not showing up on any of my tests. I don't have a phosphate test. I was also thinking it could be silicates as well. I may throw in some carbon also. Thanks.