Identification help with lifeform in Calcium dosing reservior

[ReefEngineer]

Can anyone help ID whatever has been growing in my DDR calcium dosing reservoir? When the DDR was received new the calcium level sensor bracket has snapped loose at the glue joint so I used some frag glue to make the repair. Months later I noticed white wispy stuff in the cal solution and have been unable to identify or eliminate it. I dumped the contents and filled the reservoir with vinegar, H2o2 and RODI. During this process I pumped the DOS head and tubing with the vinegar, H2O2 and RODI water. I also removed and scrubbed the optical sensor from the bracket and also the cal siphon tube. Afterwards the DDR was left to air dry for 5 days. I made a new batch of BRS calcium 2 part solution with newly made o TDS RODI from a 7 stage BRS system. About a week later the same reservoir had the same white stuff growing in it. I also have been finding similar stuff on the sump walls just above the waterline. I monitor all of my parameters closely and nothing is out of the norm so hopefully we can focus on an ID from the solely the pictures. All corals and fish are good in this 60 gallon mixed reef.

Any help someone can provide would be very much appreciated.

 

[Big G]

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[ReefEngineer]

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[ReefEngineer]

Here are some additional pictures. The microscope images are at 60X. Can anyone ID this stuff?