Quote:
Originally Posted by zachogden
Possible? Sure. A pH of 7.4 (call it +/- 0.2 with kit and interpretation error) is very very low and probably indicates, as others said, poor gas exchange as well as a reduced buffering capacity in your water. If I were you I'd ditch the glass tops and keep at least one of the powerheads pointed up for a week or so and see what happens. Try and just change one variable at a time, i.e. don't adjust vinegar, GFO, feeding, light schedule, powerheads, etc all at once.
If you need a top for jumping fish, consider a mesh or screen top.
edit: also, try and test your pH around the same time of day if possible. pH swings lower overnight...my tank goes from 8.2 during the day to 8.0 at night as measured by my probe
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Thank you for the feedback.
I put glass covers over 75% of the refugium about 2 months ago. I think I will start there by removing those and seeing how the water changes.
But my questions is why the coral brain looks flattened in some areas on the other edge, fused with the rock, and half the size.
I am trying to understand if that is a high nitrate, or high phosphate or even ph issue.