20 isn't too bad as long as you can fit everything in there.
Yeah, I had the Remora for a while... it's plug and play but there is not a lot of contact time going on there between the bubbles and water... limited bubble production in my book. If money is an issue, those needlewheel Coralife skimmers kick out the gunk and fill the tube with air.
But I think a strong return pump and a better skimmer would help. And get your alk in shape as suggested. Good luck!
We want the tank to look good for the next video.
