HELP

I walked into my fish room to see this on my toadstool today, what is this? Will it harm my coral, what should I do

HELP🚨‼️

Can I just come out here and appreciate the work that goes into tanks

I’ve been hobbying for 2 years now, the hobby is incredibly time consuming, I have to hold my hands up to applause the people who have hugely successful tanks, any tips to get mine looking good, I have algae and aiptasia in mine, it’s 35l

The pic of the tank is 2 months ago, algea on the rocks has gone a small bit, brown dust on the sand has gone too

Reef looking good

Some amazing growth on the toadstool

Sonic Flares have made a recovery

We have some aiptasia 😔

Also algae is still here but it’s less, fish and shrimp are fine

Making your own all In one back

Idk if anyone has had experience in this buy it would be nice to know if you have

I’ve been wanting to upgrade my tank size for ages, I’ve worked out a way to let me keep my dream fish for cheaper than an actual pre made tank would be, I have to build my own all in one back tho. Any thoughts?

Anyone know what’s wrong with my toadstool

Help me plan my tank upgrade. The tank is an 85l Peninsula. List of things I need help with below

Additional livestock

Corals

Rockwork

Coral placement

Inverts