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Don't you have Amphidinium? Some of them are much smaller than 25 microns and they sometimes change size when going from the motile to nonmotile state.I poured boiling tap water on my 25 micron filter bag to kill the dinos so I can reuse the filter sock the next day will that work?
I placed the sock away from pets and kids I heard of people dying from smelling fumes of zoas/palys after boiling live rock in a kitchen.
I almost wish I still had them to test some things out.
Amphidinium carterae is described as being 11-17 microns long and 9-13 microns wide, as just one example.
Try to get some 10 micron socks if it's the best you can do, but filter sock material isn't the best for this job.
A much better approach than a filter sock would be a water filter canister with a pleated sub micron filter. Get the type with a 3/4" fitting. I would use a small/medium return pump that was sucking water through the filter, at the entrance to the filter would be your connection to your gravel vac. You could also run two inline with a 5-10 micron filter before the sub micron filter so you don't clog it too quickly. This will get a bunch of them out and also help with cleaning your sand. This method could also be used for other dinos as a standalone without the gravel vacuuming, like a diatomaceous earth filter. You can also run a UV inline with your gravel vac, but I haven't seen any proof that it will sterilize them if they're cystic. This is a link for the filter, but feel free to search other types or places to buy from, just look for the common size .35 micron and make sure it's pleated so you can clean it.
This is a link that describes the ones commonly found in Australia, it leads to a free download if you want to see why a 25 micron filter sock may be wasting your time.
(PDF) The benthic dinoflagellate genus Amphidinium in south-eastern Australian waters, including three new species
PDF | Seventeen species of the mainly sand-dwelling genus Amphidinium are reported from south-eastern Australian waters. Three new species are... | Find, read and cite all the research you need on ResearchGate
www.researchgate.net
Good luck, I hope this helps.