Slimy ATO and RO water ??

[gregzz4]

I'm new to keeping SW, as many of you know ...

My RO water has never been slimy, but my ATO is
My 10g ATO tank, that I top up manually, is developing slime
It sometimes pumps slime into my DT ...
The pieces of slime float around my DT until they either are removed by the overflow, or are shredded by the pumps
My ATO has a maxijet 900 and it keeps the water well mixed

I've read on the web about others having the same issues but no one has ever stated whether it is an issue or not ...

I may have contaminated my ATO holding tank by rinsing my hands in it ( I know ... stupid me )

It was too easy for me to rinse my fingers in it after playing in my DT

I will clean it out and not rinse my hands in it again, but I see many people on the web with similar complaints about slimy RO water

Has anyone ever dealt with slimy ATO water ?

How can we keep our ATO water clean ????