If it wont cure PLEASE THROW IT OUT. DO NOT USE IT
let me explain. I had used somewhere between 12-20 tubes perhaps more of the deltec epoxy in my tank. Never had an issue, large amounts small amounts medium amounts ect.
One my tank was nearing it's peak performance I attempted to attach a large coral to the rock. It never cured and the water was really cloudy. This is normal for a small amount of time but a few hours later it still hadn't cleared and my fish were dead or dying. As I said I had used it many times so I knew how to mix it ect.
The next day when I was tearing my tank down I took it out and it was still soft. My fish sufficated and I lost my prized Hawaiian Flame Wrasse supermale, my great barrier reef labouti wrasse, foxface, Lineatus Wrasse among others.
For this I can never forgive deltec even though their products are great and this certainly was an isolated incident.
A few things to keep in mind when using any epoxy:
Keep your skimmer on even if its going crazy, just dial it back all the way so it doesn't continue to overflow. This helps keep your water oxygenated. This is also a great time to do a water change and get some fresh water into your system. If you have to turn off pumps that are blowing in the area you are epoxying put an airpump in the tank or point powerhead in another direction.
My corals mostly survived and there was no long term damage its just my fish sufficated from lack of oxygen.
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