Hi, Badflash. Looks like a real nice system you have here. Very well thought out.

I thought I read or talked with someone who warned against solids build up in the growbeds or elsewhere in the system due to eventual generation of hydrogen sulfide. You mention in your posts that you are thinking you can eliminate the sand filter if you get plants growing. Won't your beds get all gunked up with solids and lead to problems? Or is there some aspect of doing that that I don't understand?

I did call the aquacube guys a week or two ago but those are fairly expensive, too.

I have been looking around related to biofilters and found some interesting information. This page shows this gentleman's study into the most cost effective surface area of biofiltration that he found.

http://www.wernersponds.com/biofiltermedia.htm

This guy sells the scrub pads at what looks like a pretty reasonable price.

http://www.monsterfishkeepers.com/fo...16#post2939616

I am thinking I could buy a bunch of these and put them in an onion sack then stuff the onion sack down in a piece of pipe and set it in the fish tank vertically then put air stones in the bottom and bubble air up through the pipe. I can pull the onion sack out periodically and give it a beating in a drum of water and then replace it in the pond. I also thought I could put a finer mesh under the scrubbie pads to keep some of the solids off of the scrubbies and then clean that filter out fairly frequently.

What do you think of the scrubbies?

Wes