Mackie Posted January 16, 2022 Share Posted January 16, 2022 Can anyone tell me what this is on the inside of the glass? Fresh water aquarium, live plants- all water parameters are good. Its a fairly new tank that was set up for baby mollie fry. I do 50% water changes/ gravel vacume twice a week to keep up with their waste 1 Link to comment Share on other sites More sharing options...
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