What do you feed the tank with? As mentioned before it looks more like cyano. Cyano is typically dark red but can also be blue, green, or brown. Dinos will usually develop noticeable air bubbles especially when the lights are on. I’d increase the flow, change out filter socks or other mechanical filters regularly, water changes and vacuuming what you can from the surfaces in the tank, and the Id look closely at what foods I’m using. DO NOT dose the “magic potions” either unless the corals start to die from the slime, they will somewhat “work” but unless you find the cause of the slime you will inevitably have to deal with it again.