toadstool white stuff

merubal

New member
Recently my toadstool is having some white stuff on top of the crown and it is some how spreading. They look like white dust. When it opens it would open on non-white areas.

The only change I had are:

1) A new introduction of a UV light
2) Chiller from 79 to 76 degree
3) Replacement of the lighting from 140W to 260W.
4) A couple of peppermint shrimps

Any ideas?
Thanks
 
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