Extremely Cloudy Aquarium Water

Hi, as the subject says, I have extremely cloudy water. The tank is
fully cycled 20g and is a year old. I know this cloudiness is a
bacterial bloom, the water is not green, so an algae bloom is out. The
inhabitants of the tank a

*All Fish Are Fully Grown*
4 Black widdow Tetra
6 Zebra Danios
1 Snakesking Gourami (6 inches)
2 Serpae Tetra

Water Chemistry
*All measurments are in ppm.*
Nitrite = 0
Ammonia = o
Ph = 6.8

I had a 6 inch Pleco, but I removed him in hopes of that would clear
up the water. But removing the pleco was to no avail. I have tried
everything! Crystal Clear drops, did nothing. Adding extra carbon to
filter, did nothing. more water changes, did nothing. ( I do a 25%
water change every other week.) Cutting back on feeding, did nothing.
Minimizing the time the lights are on, did nothing. Adding AlgaeFix
drops (I thought it might be a freakish algae bloom.), did nothing. I
have no clue what to do. Is it possible the filter is inadequate? It
is a Liberty Eheim. Any suggestions would help.

Many Thanks...
Evan Davis