algae on sand

My substrate was filled with GHA, so i took the superficial part out and washed it with hydrogen peroxide I know that kills good bacteria too, but nothing else was working Anyways, when i put it back into the tank, a bit of the algae that stayed got buried Is that a problem? Will it die and...

Hello, so I have been into the reefing hobby for about a year and a half now and about 4 months ago I purchased this 30 gallon tank and cycled it, and placed a few fish and corals in. I am at about the 3-4 month mark and all of the sudden this strongly algae began to grow very quickly and in a...

I am not sure if I am getting blitzkrieged by different kinds of algae. Attached are pics of the uglies from my 75G tank. The tank is about 6 months old and I have low nutrients (2-3 ppm on Nitrates, 0 ppm on phosphates), so I assume dino but I cannot see any of the characteristic bubbles on...