air bubbles

Does anyone know what these black bubbles are on the coral, and should it get rid of them?

Hello! Here's the thing my tank is a 12 gallon nano, 3 months old and my parameters are the following: NO4 0, NO2 0, NO3 10ppm, PO4 0.5, 9dkh, pH 8.4,Ca 445, Mg 1170, SG 1024. All test done with Salifert. Is stocked with a yellow Watchman goby, 4 blue legged ermits and a turbo snail. My problem...

Hello all, I currently have 3 stacked systems (two stacked aquariums above a sump) that are doing great, but all have a common problem, bubbles. The bubbles come from the top tank draining to the lower tank. I am moving to a new home and plan on running the same type of setup, however this time...

good or bad? is there anything to be mindful of? any species that could be effected? so on and so forth.

I’ve had this aqueon 40 gallon for about 6 months now and when I set it up I made sure the tank and stand were both completely level and everything has been fine. However I did a water change last night and after finishing I noticed these air bubbles in the seam and I’m not sure if the tank is...