?

My husband added too many fish at the beginning. 17 total, about 19 inches worth of fish, mostly mollies and tetras, & 2 kissing fish. Several died. I have moved the remaining to another tank that is clear. Have 2 left in the tank that didn't want to be caught. I have changed 20% of the water a couple times and changed the filter. I want to fix it before the other 2 fish die. The water is white cloudy, and started about 3 weeks after the tank was set up. I bought an additive that is supposed to solidify the particles so the filter can catch them, but hasn't seemed to help.