I have been reading on some posts and I am a little confused. I don't know if it is good to have a filter or not. I use a Filstar with two of the course black filters, two fine black filters then bio media on top of that. I also have a protein skimmer and two power heads in a 45 gallon tank. Is this over kill or should I have a different set up? My sand is creating some red spots all over glass and I also have a green film all over the glass and equipement. I do a 5 gal. water change every 2 weeks and clean all of the glass, just keeps coming back.