Help: Clumping Sand Bed

[PoonTang]

Originally Posted by Whatigot

I'm sure you've seen this in the reference library, but just in case you hadn't...
could still be a possibility depending on your water changing regime and filtration.

http://web.archive.org/web/200107220...=&RecordNo=181

Yes i saw this already and although it sounds the same as what I have he offers no solution.

[Whatigot]

I had issues with Cyano and I just stopped dosing vineagar with my kalk and doubled my water changes until it was gone.

Not the same issue, but very easily related.
I would exepect that if the issue mentioned in the article is indeed the same as your experience that doing a couple extra h2o changes should do the trick.

Maries comment carries some good weight as well IMO.