looks great!
as to the issues you've been having with slime and surface stuff... just my opinion, but i think you are severely underflowed. 92 gallons is a lot of water, and even with a nice big return pump like you have, having only one powerhead is going to leave a lot of dead spots in yiour tank. additionally, as you increase the load on your tank, having good surface agitation for oxygenation is going to become more key. i'd order up a few mj900s or 1200s... they are tiny, yes, but you can get them cheap online, and having some of them in there will work wonders... a bunch of mj1200s are still cheaper than most of the "big" powerheads. adding a loc-line flare nozzle to your return will help distribute the flow also. again just my opinion, it's looking great so far!