What Is This???

Sounds like an algae.

If you can get a picture, we can get you a more accurate description.

How old is your tank and what are your nitrates currently reading?
 
it was a big gallon of like fresh water you buy from the store i know your not supposed to use tap water right
 
You mean spring water. It must have been fun buying 150 of them!
You should not use tap water. You may want to look into a R/O unit.
 
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