algae on coral

Hello, As you can see there's algae growing on the fungia coral. I tried brushing it off with soft bristle kids toothbrush very gently to no avail. It somewhat responds to feeding. Are there any ways to rescue this? Perhaps a coral dip of some sorts? Thank you.

Hi fellow members, New to the reefing world and still learning. I have a 20 G tank with good parameters. Tank is under 8 weeks old. I have 3 questions regarding 1) green looking algae in my filter 2) on my coral and now at the base of that corals plug (coral I am not sure what it is; I won...