| | Re: Crypt melt. need advice.
I'm not an expert on crypts, but I may be able to help. I do not think that the light itself is causing your crypts to melt, I think that it is just the fact that you changed the lighting. Crypts generally like stable environments, and when you change something, they will sometimes respond by melting. Some sensitive crypts will even melt if you just move them around within the same tank. I think that the melting might just be them adjusting to the new environment that they have been placed in.
Usually crypts will melt and lose most if not all of their leaves before starting to regrow new leaves and recovering. Your crypts will probably be fine, they may just need some time to adjust to the new light level.
As for crypts preffering low light, I'm not really sure. They may prefer low light, but I think that they will still grow just fine with higher light. I have a bronze wendtii crypt that has gotten huge in my 29 gallon tank and I've got 96 watts t5 ho 6500k (~3.3 wpg) directly over it.
Hopefully your crypts adjust to the new light and bounce right back.