If your planning on going full marine with corals at some stage in your setup then you don't want to run bio-filters, they create nitrates which will kill the corals. Also running bio-filters now then trying to remove them later can cause problems.

Well I wasn't planning on going corals anytime soon. I was thinking using alot of rock and maybe a bit of wood. Can I use wood in a marine tank or only a brakish? I could use that fake wood stuff. I would probarbly get a new tank if I wanted to get corals.

I was under the impression that bio filters are totally acceptable for soft coral tanks. 640L is huuuge you probably want about 150-200L. Remember these auctions only run for a week, there are plenty of tanks around.

You can use wood in marine tanks, I dont think it would cause any problems? And from the sounds of it you can make jouvenile puffers into full marine safely.

great thanks for your help feelers

Ooh- I have found one : http://www.trademe.co.nz/Browse/Listing ... d=77579980

I hope the price isn't going to rocket though- it probably will!

try get him to put up a buy now, good luck!!!