Ditto with Dion... a Fluval 404 stuffed full with 2 bags of AC, 1 bag with 150g of pO4 remover, and a small square filter pad as a prefilter to keep any wandering gunk from clogging the media bags - running 24/7/365 and the skimmer 24/7 as well... I change the AC and filter pad monthly; I've gone as long as 9 mos. with the single 150g "dose" of ferric hydroxide before changing it - although that was with the 125g tank. The 225 I'd say every 6 mos. is a safe bet.
Never hurt any of my corals or slowed down macro growth...
Mark / Wendy - you might try starting off with a very small amount (like a tablespoonful) of phosban and working up to a full "dose" I guess you would call it... I don't know that it's the addition of the phosban that ticks off the SPS, but rather the sudden removal of all the phosphates from the water column that a full dose will do that makes them unhappy...
P.S. - Fosters and Smith carries their own brand that's the same stuff as the pricey phosban at half the price (on "sale" now at $ 6.99 and phosban is around $16 - $18 for the same 150g container...)
Edited by carlso63 - August 07 2008 at 7:11pm