Hey everyone, I am new to this site and also new to fish keeping. So far I have had an Aquarium for about a month now and i have a lot of questions. It is a 90g freshwater tank that my uncle had gave to me. It is not a planted tank and I only have 8 small fish and just got 2 Bala sharks. I am using a Emperor 400 as the only filtration (and is this enough filtration?). There is also a lot of brown alge that has quickly formed, can eveyone help me with this and give me some advise on how to keep a clean and healthy tank?