Thank you both for your replies,
Louis, the forums ââ"šÂ¬Ã…"œdown underââ"šÂ¬Ã‚ donââ"šÂ¬Ã¢"žÂ¢t get any where near as much traffic as Reef Central, RTAW an Aussie forum only has approx 600 members where Reef Central has over 15000.
I was steering clear of the bio balls due to the bad press I had been reading on this forum, seems like everyone has a different slant on the same subject, I guess there is more than one way to skin a cat as they say.
Maybe I could do a combination of the two in the sump? And remove the bio balls at a later date if they became an issue due to excessive nitrates?
Any way thanks again
Mark