About a week ago (after my first PWC with RO water) I noticed some white fuzz on the surface of the substrate in my tank (Fluorite mixed with blue regular aquarium gravel with a bottom layer of API Laterite). I didn't think anything of it, dismissing it out of hand. Over time it has spread to cover 1/4 of the substrate surface. Again, I dismissed it. This morning during feeding time, I noticed my Malaysian Trumpet Snails, which are normally burrowing through the substrate, at the surface and making a run up the tank walls for the top of the tank. They are also crawling along the surface of the substrate, but not burrowing. What's more, they are avoiding the patch of white fuzziness.
The only thing I can liken it to is some white gunk I fished out of the Plantex CSM+B liquid fert concoction I add to my RO water for iron and trace elements. Could some of this gunk gotten into my 10 gallon? And if so, is it bad? I had no cause for worry until now, when my MTS appear to be avoiding it. My other critters in the tank (zebra nerite snail, scarlet badis, 2x emerald dwarf rasboras, RCS) appear to be unaffected, as are my plants.
Here are my water parameters, and some photos of the white fuzz:
pH = 7.2
NH4 = 0.25 ppm
NO2 = 0 ppm
NO3 = 10 ppm
Cu = 0 ppm
KH = 6 degrees
GH = 8 degrees
Temp = 74 degrees F
Misplaced my PO4 and Fe test kits in the move.
Help!
White fuzz on the surface of substrate, MTS making a run for it
