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Old 09/12/2015, 05:31 AM   #1783
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Join Date: Oct 2001
Location: Iceland
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DNA made very interesting posts a few days ago on the reason why water changes make dinos bloom.

Originally Posted by DNA View Post
The square is still there.

Last year I did jet another of my brilliant tests.
I siphoned off the top layer of sand into a bucket and let it dry out killing loads of dinos.
Some months later I dumped all the sand back into the tank, knowing there were lots of toxins going in with it.
A Royal Gramma and a pair of Mandarins died in the days that followed.
Much of the dino population disappeared as well.

The square test and the dead dino tests are virtually the same.
I'm theorizing that Ostreopsis dinoflagellates can't tolerate their own toxins.
This is the limiting factor on dino densities I've been looking for since day one.
In the ocean dino blooms get much denser than in reef tanks because the vast ocean carries and dilutes the toxins from the dead dinos.

Did we just reach another milestone?
Originally Posted by DNA View Post
Not convinced yet?

Many of us have seen their dinos bloom right after water changes.
The toxins got dilluted.

The dirty method: Turn off the skimmer and filters and let the toxins build up.
The clean method: Kill the dinos with UV and let the toxins build up.

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