Do crypts melt through having tannins in the water or even soft water in general? Last week I added some blackwater from my driftwood soaking tank into my main tank after adding some ember tetras and this morning I noticed that half of my crypts have started melting. I did add the water in cold but thats what I always do and the crypts have been fine, the only difference being the water had tannins in it. So I was just wondering if there was any association between tannins and crypt melt?