From what I've read Fluorish Excel helps in getting rid of algae by making your plants outcompete algae for nutrients. If I start using Fluorish Excel in a 5.5g planted tank which is only 2 weeks old and cycling, will an oto still be a good idea? If the Excel helps keep down the brown algae that otos like, then I don't really see a point in getting one after the tank's cycled.