White Stuff on Inside of Glass

[DawnMichele]

Hi everyone. I noticed the other day my Angelfish tank getting some kind of white stuff buildup on the inside of the glass. My other tank's don't have it.

 

[iridescence]

biofilm

 

[kno4te]

Pic may help.

 

[DawnMichele]

Pic may help.

I will take one tomorrow.

 

[DawnMichele]

Hello. Here's a picture of the white stuff. The best way it comes off is with a razor blade.

 

[kno4te]

If guess calcium build up. Hard to say since your in fl with all that hard water.

 

[DawnMichele]

I wonder why just that tank?

 

[jjohnwm]

I don't recall ever seeing calcium or mineral deposits forming entirely underwater; that's more of a thing at the water line when the stuff is deposited as the water evaporates.

I'm guessing that it is indeed some kind of biofilm; that's a pretty broad, catch-all phrase that includes any combination of microscopic life forms growing on submersed surfaces and objects. Weird how it's concentrated in that spot.