So some background information.
I have a filtered 5g tank set up with 1 betta, a few mystery snails, and 3 cherry shrimp. The tank as been set up with the betta in it for probably 4-5 months with the snails added 2 weeks ago and the shrimp 3 days ago. The tank so also set to 80 degrees. It also gets natural light from a window but it is not very bright at all since the window is between the house and garage.
I have two lucky bamboo plants sticking up out of the water with the roots in the gravel, floating water sprite, an anubias tied to drift wood, java moss tied to drift wood and a marimo ball.
I do water changes of about 50% atleast once a week sometimes I do water changes more than that though. I add prime and was adding Flourish Comprehensive but when I noticed the algae I stopped.
Other than the snails and shrimp which have come from a very trusted LFS the only really recent changes are a new piece of drift wood (bought 3 days ago with shrimp), java moss (also bought three days ago). The second older piece of driftwood, watersprite, marimo ball and anubias were all added roughly the same time about a month or so ago.
Now the algae is a grayish color that grows on everything. Plants, roots, surfaces, gravel. While I'm siphoning it almost looks like the tank is smokey. The filter has a baffel on it which I'm thinking might be part of the problem because of stagnant water but my betta doesn't like the strong current. Any help or ideas are greatly appreciated.