I have some kind of wierd clear mucas (snot) that forms on my ph probe. I use a toothbrush almost daily to remove it, usually at night to make sure my controller can stop dosing kalk if my ph gets too high. My nano will get the same type of snot on the ph probe, but usually only if i dont clean my probe for extended periods of time (3 - 4 weeks). Anyone else get this, any ideas?