yeah, should have mentioned it wasnt green, so looks like a bacterial bloom. It sort of looks like clouds of cigarette smoke rolling in the water flow from the filter.
Did a 60% water change today, have got rid of over half the guppies, and will stop feeding them as of now (except for the free food/fry the female guppies are delivering).
How long till I should expect to see a change in the water quality? a few days? a week? a month? a couple of months?