My reef got nuked

[Radoi Florin]

Hi guys!
My saltwater aquarium is 4 months old and everything was looking so good untill this morning.. the water was cloudy and my corals and fish were intoxicated with this transparent slime. I moved them into a secondary aquarium and scrubbed all the rocks and sand. It was everywhere. My filter was full of this stuff.
It’s a 200L aquarium with a sump and an canister filter. I made it this way because I have no room for a bigger sump, this one is 15-20L.
I have a skimmer running 24/24 and a 34w UV light. Nothing is working. I am not carbon dosing, and I didn’t added somthing new to the tank. I have 2 cliwnfish and a daemsel fish from the beginning. The rocks were full of xenia and others soft corals.

amonnia : 0
Nitrite: 0
Nitrate: 15
After I made 60% water change and scrubbed all that slime in a fiew hours he was growing back slowly. Is so confusing.

 

[Tamberav]

Definitely looks to be something bacterial.

What do you have for flow in the tank?

Do you regularly clean the canister?

 

[Radoi Florin]

Definitely looks to be something bacterial.

What do you have for flow in the tank?

Do you regularly clean the canister?

I have 2 wavepumps. And I make the mantanance of the tanks every week. Cleaning the glass, making a 20% water change, cleaning the canister, skimmer. That’s it.
I’m thinking my little boy opened the sump room and stucked his hands in the water there. And he was having something on his hands. This is what I’m thinking.. not 100% sure.
He is 1,5 years old and I can’t ask him. He says “yes” to every question

 

[elysics]

Yeah if he had marmelade or anything else containing sugar on his hands then your tank got a massive overdose of carbon

 

[Radoi Florin]

I added now seachem pristine for disolving that slime. Do you think is ok? I saw some post of someone using dr tim waste away, but I don’t have this in my country. And some seachem clarity

 

[Quietman]

Think I'd do another big water change (or two/three over this week). If it's bacterial bloom due to serious overdose of jam (carbon) it'll balance back out. Keep flow up with surface agitation so you don't run into any oxygenation issues.

I wouldn't add anything else to tank (except new water).

 

[muzikalmatt]

Definitely agree that it looks and sounds like a bacterial bloom. I'd do several water changes over the next few days, maybe run some carbon and/or a Polyfilter in the canister if you can just go try and remove any potential contaminants.