Tank cloudy after water change
I have a 30 gallon freshwater tank with roughly 15 various fish - some dwarf gourami, danios, tetras, and a couple of chinese algae eaters. The tank has been in good shape. However, I recently have had a bit of an algae problem - it was growing on the plastic plants and an air bubbler. I did a thorough cleaning - I changed about 20% of the water, cleaned off all the plants, and changed two of the filter mediums (the sponge and the carbon filter). I also used a special scraper from the pet store to try and clean the inside of the tank out. However, now the tank is cloudy! The fish seem to be doing okay, but this can't be good at all.
This was all a week ago. I just did another 20% water change, and when I poured the old water down the drain, it definitely had a green tint to it. I put in fresh water, and the tank doesn't look any better.
I think the tank has gotten slightly cloudier. I am assuming that this is some sort of free-floating bacteria which is causing this. Does this sound accurate? What can I do to clean this out?
Thanks for any help.