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James,
How often do you feed, how much and what do you feed?
Do you blow your rocks off before doing a water change?
Nitrate reading?
How old are your bubls?
Does the tank get sunlight on it at any point in the day (indirect as well)?
And, you probably could use more flow. I'd point two small powerheads behind your rocks. Well, it all depends on how your layout is.
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