[nemo79]

I have aragonite crushed coral for a substrate and it's not deep. I wanted to know why I see bubbles trapped in the substrate? I know this is common with a dsb but a sb of crushed coral?

I have had alot of micro bubbles from the numerous water changes I have been doing to lower the nitrates but would this get trapped in the substrate? I have bubbles attached to my heater, powerheads, even on my algae?

I have also noticed a red/burgundy algae on my glass. It's not slimy, nor bubbled, it looks the same as green algae...just not green. Mind you the micro bubbles in my tank love to attach themselves to all the algae..it's aweful to look at.