Kalk paste and fish
 

I covered a nice little piece of aptasia with Kalk Paste. Ive noticed that the paste is now slowly coming off the rock and my fish have decided to give it a taste. Will this harm my fish?

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The aptasia shouldn't hurt them as many fish eat aptasia anemones. The Kalk paste on the other hand might.

Sorry, I edited my post. it is the paste that is coming off and that the fish are tasting

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Fish taste things much like we feel things with our hands, it is how they explore. I would remove the Kalk paste just to be safe though.
As far as the aptasia is concerned; try a turkey baster filled with boiling water to kill it, it has worked for me with great success.