filter suggestions for mini bow
I have a 2.5 gallon mini bow tank for my betta and shrimp. I'm loving the tank but I'm having issues with the filter.
I was able to baffle it with a prefilter sponge that my shrimp love grazing on. The problem I'm having is the way that the filter is set up it is directly exposed to the light. Because of this there is a ton of algae growing on the cartridge. I replaced it a week ago and it's already covered again.
I don't want to be constantly replacing it because it's expensive and it's going to mess up my cycle every time.
Anyone have any suggestions on how to fix this problem? I'm assuming other people have this tank so have you had the same problem?
Is my best bet just changing out the filter? If so, what filter can i use that will fit in the hole in the hood.
Also, there are a ton of tannins in my tank. I don't know why t's so bad. But what filter media would help the most?