I have cleaned out my tank about 4 times completely now because of algae problems in my tank. It's a 12 litre and I've had it since December. I used to have 10 neon tetras and a betta but I sold my neons because my betta was picking on them. Im not that experienced in fish keeping but I have tried so hard with my tank to keep my fish healthy, I've done water changes and pH testing and I've just added an algae formula to help out in the next week. I don't know what to do. I have cleaned the whole thing multiple times yet algae keeps coming back. And now my water is clouded and green! I can't even see through my tank! At first I thought it was a bacterial bloom but now it doesn't look like it. Does anyone know what this is and how I can prevent it? What can I do? Maybe some tips? I am worried for my bettas health. Please help me out! I feel really bad for him!