- Joined
- Sep 22, 2016
- Messages
- 962
- Reaction score
- 183
- Location
- Los Angeles
- What state or country do you live in
- California
So tank is 6 plus years I have begun over a period of time to take out 6 inch sand bed that is a phosphate trap. My rocks Al's I have slowly tooken out to soak in acid and give it a bleach soak. My phosphate was 90 on hanna ulr ane this stuff slowly pops up. What is it?

