This looks like a typical bacterial bloom.
I have experienced this in the past when doing water changes when the tank water is above 28 degrees celcius and the change water was fairly cold around 17-20 degrees celcius. The bacteria appears to go into a shock like stage and free roam in the water. A few days later and the tank clears itself.
I have experienced this in the past when doing water changes when the tank water is above 28 degrees celcius and the change water was fairly cold around 17-20 degrees celcius. The bacteria appears to go into a shock like stage and free roam in the water. A few days later and the tank clears itself.