To me, that looks like calcium carbonate precipitate to me on top of algae. If that's the case, you can use a turkey baster to blow it off. Test calcium, alkalinity, and magnesium as precipitation can seriously deplete them. Maybe a better pic??

I'll get some tests and pics when I can get away from work, for some reason they don't think my fish tank problems are reason to not be at work

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Tell them your dog needs to go to the vet. "They" never understand fish tanks because they are just picturing some cesspool 10-gallon tank with guppies. :twised:

What I mean is Kalk is a calcium and alkalinity additive so if your dosing or adding any other types of calcium or alkalinity then your dosing more then what the Kalk directions tell you. If you want to run Kalk make sure your not adding any other types of calcium or alkalinity to the system.

Start slow And test you won't go wrong

K that's what I thought you meant. At the moment the kalk is the only extra thing I'm adding to the tank

I don't dose Kalk, but from what I had read, are you not suppose to mix the solution, let it settle and then only use the solution on top and not what precipitates to the bottom?

From your post it sounded like you put in everything. If I remember right, I think that would cause you calcium to precipitate out.

I mixed it let it settle and had the pump go on later but it feel of my stand and sat on the bottom and grabbed the gunk that was there, or so I'm guessing. Hopefully the damage isn't to bad

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Well for anyone wondering turns out I need some cooking lessons, used table spoon instead of teaspoon, lucky everything is looking normal again and I drained the kalk out. Did a water test and every parameter was pretty good. Did a water change and today all is back to normal!

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kalk must be consistently stirred to not allow the sediment to hit the bottom. If you do use an ATO to dose, make sure the pump is in the middle of the waterline, as to not suck up the bottom of the reservoir - if you dump the entire contents of your ATO sludge at the bottom into your tank, this is what you will get. But there are also dangers in this, as it is highly concentrated, you may see a large alk/pH swing, and that's what you should watch out for.

test pH/alk/Ca, regardless of your waterchange.

I would suggest not dosing Kalk unless you need to! You're levels are normally sustained well just by doing regular water changes. Depending on your coral load, you probably won't need it.

Yeah I made a pvc stand so it doesn't sit on the bottom. I did check after the water change and all tested good

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