Thanks for everyones advice
I hope its just part of a normal tank cycle... I have been doing the following since I started up the tank...
- weekly water changes with bottled RO/DI (4 gallons a week) 24 gallon tank
- purchased a urchin & 6 hermits within one week (no GHA at that time)
- blow off all the rocks with powerhead weekly
- suck debris off barebottom weekly
I'm suprised to see the GHA at all as I thought I had done a good job - hopefully just part of the cycle.
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24 Gallon NanoCube: Stock
72 watt PC lighting
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