Powerhead went out on my 30 cube so currently making do with a nano 425 which is about nil water movement (also took the bubble trap off my hob skimmer to produce more current temporarily and this is making some difference thankfully). I think that was a knockoff 800gph. I need to replace it for sure.
My 120g is running all maxi jets which i need to upgrade to koralia - i like the cleaner look and better spread with koralia not to mention magnets for moving them easier - these ones came with the live rock and have gotten me through so far. PM me if you can and let me know what you think might help and price.