coral

Depends on the coral type.

For almost all corals your best bet is to introduce the corals to a fully cycled system.

I would not put a stony coral in a tank with freshly made up saltwater unless the water had been mixing for at least 24 hours and I was starting the tank with full cured live rock.
 
I moved into a new house last April and my tank crashed I lost all of my fish and a lot of invertebrates and a few coral and I was so upset about it I thought I would get out of the hobby all together but I recently decided to go ahead and rebuild I haven't been taking care of the tank like I should because I didn't really know what I was going to do and it's starting to get some crazy algae and cyanobacteria so I was going to take the surviving coral and put them in a different tank while I clean this tank up
 
If you have a spare tank laying around, take water ONLY water from your existing tank that has the coral in it. Put the corals in there. Make sure you have the adequet flow, heat, light etc.

Top off the established tank with new water. Then tackle the algae issue.
 
Normally I would recommend allowing the tank to age for several months before adding corals. The main reason being to allow the tank itself to become stable. But to try and save corals it might be worth the risk to move them right away.
 

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