bluehairman;2087567; said:Option 1: buy bio spira, check your lfs refrigerated section, look for BioSpira or DrTim's Aquatics One and Only Nitrifying Bacteria to have your tank cycled overnight.
Option 2: remove your fish and let the tank sit for 2 weeks checking water params until nitrite and ammonia = 0. maybe buy a cheap fish that can handle tough water conditions while it cycles.
next time, change one filter at a time, or better yes just rinse the filter for about 10-15 seconds with COLD not hot water. also what fish are in the 75g?
i recommend getting a sponge filter, they hold large amounts of beneficial bacteria.

It's been setup for 4 weeks now. I'll test the water parameters and stuff tomorrow again. There's a Whisper 3 that I put brand new cartridges in. I just moved my AC40 over to it also, it had been running on my 20 for about a year now. I didn't change that filter though. I'm thinking aout putting a couple sponge filters in though.Bderick67;2087977; said:How long has your tank been setup?
Do you test your water parameters, ammonia, nitrite, nitrates or pH? If do what are the levels?
You mentioned that you changed the filters, does this mean you cleaned them and changed the cartridge or did you get new filters?
What type filters(brand and model) are you running?
There are a few reasons why your tank is cloudy, so provide as much info as possible.