Thanks for the info. I hope to get those pumps by Wed. of next week. I was cleaning the glass this morning and I must have caught a some sand in the scraper and WHAT A SHAME, I scratched my glass MAN, WAS I SICK. I wish my tank was all finished all the coral in place with a couple of more fish that will be it. I will have maybe a total of 10 fish and I will not over crowd my tank with corals, they will grow. Can I add like a hang on the back filte but do not put the filter media in it just to add some more water flow, will this be ok? My water is clear everything is in check no water probelms other than the light green film ontop of the surface, I soon, hope to be rid of. I was speaking of the hang on the back filterm, will help with more oxygen to the tank? Oh by the way, I have about 60lbs of live rock, is this enough or do I need to add more?