Powerful Oto Shit!

[chooz]

This is referring to my other thread on diatom which I thought was the case initially:
http://www.aquaticquotient.com/forum...ad.php?t=61781

Then I found out that the brown stains on the glass are actually due to Oto shit. I think many of you do not believe me when I described it in the above thread.

So I finally got a picture to show it. Note the shitting oto and the stain beside it.

The question now is: How do I get it of rid? Hand wiping with rough tissue paper does not get rid of it, so do using finger nail to scratch at it.

[StanChung]

Try using a plastic card. An expired credit card or similar.