need help with slime!!!

tank is a 55 gal with 30 gal sump/fuge, 4 fish in it are 2 clowns,1 blue tang,and a royal grama. temp is always 80 i use a skimmer,3 powerheads,filter sock,and have a 4-54watt t5 setup on timers.. blues come on at 10:30 am then daylights come on at 11:00am then daylights go off at 9:30pm and blues go out at 10:00pm.. i keep getting this slime build up on the sand,but it is only on the left side of the tank,and never in the fuge. any idea why its doing this??

I had an outbreak about a year ago, so I feel your pain! I used a turkey baster to loosen the algae, then used a fish net to remove the pieces. After it was out of the tank, I adjusted a powerhead to hit the infected area better. I haven't had a problem since. Other than the slime, your tank looks awesome!

I had the same issue in my 55. I would vuccuum it out with every water change. Kempo is right with the flow. I believe that stuff stems from not enough flow in a certain area alowing nutrients to gather for the diatoms (?) to feed on. Play with your powerheads to get more flow in that area. I have also found that a lot of small hermits do a pretty good job of keeping the sandbed cleaner.
Looking good. Xenia seems very happy.