I realize gold fish are dirty but I cant seem to do anything about the water conditions in my tank. It just stays cloudy. Algae has not been a real problem but the cloudy water has. I vacuum once a week and clean filter. Tank is not yet mature but it is 4 weeks old. Anything I can do to keep water clear short of chemicals? Should I consider a "clean up crew" of fish? Was told nothing lives well with gold fish other than gold fish.