Hi Brad,
I would recommend the Foz Down. ;-)
It is a Lanthanum based product and when used in moderation does not cause a noticeable alkalinity drift. I have recently sourced the high purity Lanthanum directly so have been able to double the concentration and keep the price the same. :-) The bang for the buck of Foz Down is DOUBLED but consequently more care must be exercised in its application... don't accidentally spill the bottle into your tank.
The problem with the pool type Lanthanum removers is that there is several different grades of Lanthanum available on the market. I highly doubt they are going to use a more expensive higher purity Lanthanum for swimming pools.
It would cost you less than $30 to completely remove the Phosphate from that tank using Foz Down. If the Foz Down is dosed in an ATO or through a dosing pump the phosphate that the old rock releases will also be removed. Thus you won't have to replace the rock.
I personally have used it on a 240 gallon aquarium which had 1.4mg/l of Phosphate and the rock was 5+ years old. Last year the tank had an average phosphate level of <0.08mg/l with no gfo.
I use Foz Down daily on my 600 gallon Acro system and the colours are amazing.
There is a CanReef member who has used it to do a similar thing on his display tank in his store. Perhaps he will chime in on this thread.
Cheers,
Tim
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