Actually sounds like things are going well. A little die back of the sponges sounds pretty normal at this point. Given good conditions, they'll slowly grow back. You can use a turkey baster to gently blow off some of the film/ detritous. 
__________________
Jeff
"Somewhere, something incredible is waiting to be known." Carl Sagan
"It is better to keep your mouth shut and appear stupid than to open it and remove all doubt." Samuel Clemens
Current Tank Info: 50G RR Acrylic / DIY 20 gal sump-fuge, Home brew lights (2-175w 10K MH mogul with 2-54w T5 actinic+, ES5-2, mag 9.5, SCWD, TBS "package", true Perculas, RBTA, assorted zoo's, SPS
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