What is wrong with my tank?

I have the same problem. Its a pain to get rid of. I scrubbed the rocks, took out the wood and scrubbed that to. It was in all the moss and growing on plants too. I am cutting down on the lighting times and doing more water changes. Going to cut all my vallis back tomorrow. Nitrates are too high so i read and lights may be on too long. Good luck

It is getting worst since I pump up the co2
How to get rid of them?

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If everything was fine before you started using co2 then there is a simple solution, cut back on the co2 or stop using it.

Recently went through the hair algae attack in a 55G lo-tech tank.
Water changes, cleaned filter weekly, manual removal, etc...
This went on for months on end with the toothbrush removal.

Normally I only test water once per month in the tanks, during a monthly test checked this lo-tech/no-tech tank also.
All good but PO4 was no where to be found.
Dosed this tank with an EI solution to reach 1ppm of PO4 3 weeks ago.
Hair algae is now gone, now dosing about 1/3 EI every 10 days to maintain the 1ppm of PO4.

Just a recent discovery and thought to share!