I have had these in my tank, even after a cleanout, sanitisation (flushing through empty tank using chlorinated water, and then hydrogen peroxide), and a tank rebuild - they are still making their way in there.
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The new build of the tank primarily uses dechlorinated tap water, but I have also used rainwater (from a newish rainwater tank).
I assumed that these were originating from the rainwater, as such, I had been cycling my premix water using a UV steriliser filter* before adding to the main tank.
* I should note that this is not foolproof, it is a filter sitting inside my pre-mix tank, not capturing every bit of water as it arrives in, or departs out of the pre-mix tank.
Any suggestion of what they are? and if I should be concerned?
Any assistance would be greatly appreciated - Thank you.
