I have a tone of critters in my fuge and run a sock. I don't have any issues. My water cleared up greatly once i started running a sock. critters haven't suffered at all. I ran my drain into straight rubble on my 125 for the longest time. then started doing polyfill to polish the water and it really cleared it up. still had a ton of pods and stars and worms and such. The corner i just setup doesn't have a fuge which i am less than excited about. But will adapt. The sump is still stuffed to the brim with rubble. just no DSB or macro.