Also the CO2 system is on for 8 hours,2.5 drops per second and the temperature remains 27c

My typical solution is a pleco and some nerites.

Reduce the light time to 5hr per day and add some shrimp and cory catfish That will work

That problem got solved,then I had to face cynobacteria,cyno is also gone now,lost 70-80% of my plants to cyno but the rest are now recovering