Now you know why I prefer sand. You can alwsys put some flourite under
it, in fact it says on the bag it weorks as wel mixed with other stuff.

My preferred substrate these days is Farfard Aquatic Soil mixed with
profile with fine bach sand on top. To be sure there's metal partricles
in the playbox sand I buy from Home Depot - just drag a magnet through
it - and I keep waiting for something bad to happen from that. Fifteen
years later I'm still waiting.

--
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