I have had a 75 gallon tank set up for about 6 months now and I have currently 2 clownfish, 1 flame fin tang, and 1 firefish goby. I also have 1 open brain coral, green mushrooms and a colony of star polyps. I am fairly new at the Marine hobby and I had some questions about good additions to my tank that will help keep my live rock and my substrate clean. I have heard of things like sand sifting gobies and the likes. I just wanted to know what other little critters people are using to help clean up uneaten food and take care of some little alge spots that I have, the alge is not at all out of control, there is just a little bit here and there. Anyy help would be much appreciated.