- Joined
- Jan 3, 2020
- Messages
- 18
- Reaction score
- 3
11 mo old tank. Duncan's were doing good but now closed for 2 weeks. Hammer the same. Dealing with gha now. Wondering if it's due to no3 and p04 or too mu h flow. 75 gal + 20 gal sump. 2 1300 GPH WM and 2 850 GPH WM. 2 on each side of tank blowing across and upwards. Lots of movement on my gsp. Both are in sand bed.







