Ok so yesterday morning my water was fine. I had tested my water (Ammonia: 0, Nitrite: 0, Nitrate: 0, pH: 7.6) and did a weekly water change of 50% (normally I only do 25% but I decided to use the cycled aquarium water for another tank so I could separate a nippy dwarf gourami from my betta).
For the new water, I used water conditioner, aquarium salt, and NutraFin Cycle (as always, I used the amounts listed in the directions... and I have never had this problem). One thing I did do different was add a pH thing (trying to get my pH to 7.0... I think it was called True pH or something for tropical fish). I added the amount the directions told me to.
The water was looking a little blurry last night, but I didn't think anything of it. When I woke up this morning, the water is REALLY cloudy... like a whitish cloud... I can barely see the plants in the back of my tank (fake plants, this is not a planted aquarium).
I haven't rinsed my media filters in tap water.
I haven't been overfeeding.
I'm not sure what to do... I was reading that it may be a bacterial bloom (maybe from changing so much water? I did vacuum the gravel, but I do that weekly and have never had this issue). I'm not sure if I should change the water (if its from the new pH chemical I used -I know, chemicals are bad, but I don't know how else to lower the pH right now, the water here is very hard) or let it do its thing.
I tested the water this morning (only pH: 7.6 and Ammonia: 0)
My fish are all swimming, happy as can be.
Thanks for any help or advice!
Here is a picture of whats happening... the first one is what I woke up to, the second one is normal.