So I've moved my 60 cube I bought a new one drilled previous one had HOB overflow it worked great but was worried about leaks as everyone says it's guaranteed to happen. I got the tank drilled 2 holes internal overflow plumbed using durso stand pipe first time setting this up. I'm now getting some brown film over the top of the water due to no surface skim is there anyway to fix this? My intake is about 2 inches submerged
hard to see film but those bubbles are floating around. Also is there a way to get more flow down to the sump?

