Slime coat on my tank

Feb 19, 2012
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Katy, Texas
#1
So i added 2 black Kuhlie loaches to my tank and today while doing a water change i noticed that something on the glass and rocks moved. Soon i noticed it was a slime like thing because it had debris stuck on it and felt like slime. Is this from my loaches? or what? and do i need to worry about it?