I have a betta in my 26litre, im having a problem with green algae. I,ve been scrubbing the glass & ornaments myself & my problem has come from the sun shining on my tank, I,ve been switching the tank light off early. I,ve added two blue ramshorns to my tank but well they haven't done much! Do you guys have any idea what I could use? I do have Nerites in my big tank could I put a couple in their for the moment?