Two Month Bacterial Bloom?
I've got something going on in my tank that I think is a bacterial bloom, but it has gone on for 2 months or longer at this point.
When it first showed up I had just got another canister filter to go on my 55 gallon. At first I thought it was normal because of the new space in the filter to occupy.
After 3 weeks of it being a thick smoke cloud I started wondering if my eyes were lying to me and if it was green water, I couldn't really tell because I was getting rid of GDA on the glass at this time so I put on a UV sterilizer for a week to make sure it wasn't green water. The UV sterilizer cleared it out, but the week following after taking out the pump the cloud came back and worse this time and has been going through this cycle of being clear when I do a 50% water change once a week to fully clouded up by the end of the week ever since.
Stock is just 2 nerite snails, and some mini ramshorn snails. Before I started treating the tank with the UV sterilizer I took out the fish in case the tank crashed for whatever reason during treatment.
Fertilization is EI daily which is full EI dosage split up over 7 days.
Co2 is at least a 1 point PH drop using a Cerges reactor.
Filters are full of sponges and some bio-rings I had lying around.
Maintenance is a 50% water change once a week and clean out the filters in old tank water every 2 weeks.
Fish stock was 8 tiny lemon tetras and 4 pencilfish fed once a day with a small pinch of flake food.
Tank has been setup since January 25th 2020 with nothing being changed about the tank between then and July.
Tests are hard for me to tell the specific color on some of them:
Ammonia = 0-0.25ppm
Nitrite = 0ppm
Nitrate = 5-10ppm
PH with Co2 on = 6.0 lowest the test kit will go; PH after 48 hours sitting with an airstone = 6.8-7.0; PH out of tap = 7.0
KH increased from 0-1 to 1-2 using baking soda
GH = 8-9
To explain it as best I can it's a smoke cloud. Under the lighting I can see the cloud moving as if it's literally wisps of smoke or steam.
Thanks for any insight on what is going on.