Red aro get fungus babels

Hi, Pro

I have 1 red aro about 2 years about 4 months ago their babels getting problem with fungus.
I already try to take care water change about 15%/ day and 100 grm salt/100 litres but until now problem of fungus can not improve.

My tanks 160 cm * 50 cm * 50 cm with 2 pump in both sides for overflow filter system.

Please kindly check and advise me howto solve this problem.

Thanks in advance,
Clearboy