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What do you think this white stuff is on my filter?

1K views 2 replies 3 participants last post by  Hallyx 
#1 ·
I have a 3 gallon tank with a charcoal filter - Marineland brand. The filter has charcoal inside which cannot be removed or added. Per discussion on boards and recommendations I have NOT changed this filter, as it provides a place for the beneficial bacteria to grow. I have left the filter in since starting the tank - around March. When I do water changes I dunk it in the dirty water.

Tank occupant - ONLY my Betta Jack. NO live plants, no other tank mates.

Within the past month or so I noticed a white material on the top of it. Originally I thought it was just minerals. It is looking fuzzy to me now.

What is it? And will it hurt me Betta?
 

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#2 ·
It's mineral deposits. It won't hurt anything. Just wipe it off at each water change.
 
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