Annoying Cloudy Tank What Do I Do?

[Fishythekid]

ok i have a 75 gal. that has been running for 5-6 weeks and it started getting greyish around the 4th week so i tried to clear it up with stress coat and some other ones that cleared biologicaly caused cloudyness and another that was supposed to clear the water of fine particals i also did a 20gal. water change later on and it got better but about 5 days ago it started to turn green so today i did another 20 gal. change and cleaned my filter (fluval 305 with biomax and zeo-carb media i also added some super fine filter cloth to the lowest basket)
all my fish seem to be fine my ph is around 6.5 nitrate and nitrite are 0 but my amonia is above 8 but ive been using ammo lock witch changes the amonia lvl. but the readings come out wrong and i have no idea what to do so some help would be awsome. thx

 

[WILDER]

What fish are in the tank.

 

[WILDER]

That filter only for a 70 gallons, need to know what fish are in the tank to tell us if you are overstocked.

 

[WILDER]

Looked at your stock in your profile your understocked so that fine.
How often are you doing a gravel vac and water change.
Have you touched any of the sponges.
What test kit are you using.

 

[Fishythekid]

well i cleaned the sponges and replaced 2 of them and the filter is only rated 5 gal. under my tank size and with all the gravel and stuff in it theres more like 72 gal. of water in the tank so.... but doth times i changed the water i have vaccumed it

im using API master test kit

 

[WILDER]

Tank gone into a mini cycle with replacing sponges lost to much benefical bacteria.
You must do a gravel vac once a week with a water change.
Should only slightly rinse one sponge at a time in old tank water.

 

[Fishythekid]

alright thx