Thanks for the input on the aquascape, had some more ideas so I've got a good vision for it now.
The rock had a 24 hour bath in 10 gallons of undiluted vinegar:
It definitely took quite a bit of the outer surface off the rock, I was thinking I would dump the neutralized vinegar and do a second bath, but I was afraid I wouldn't have much rock left....
It's now in it's second day of an RO/DI soak with an mj1200 in there for water circulation. I did a 100% water change on it this morning and will continue to do so daily till I'm ready to aquascape this week. Tested the water for phosphate/ammonia before the wc and got these results:
PO4 ~.6
NH3/4 ~.25
Pretty much what I was expecting. There's definitely a good deal of organics left on the rock, and it's pretty apparent it came out of the ocean fairly recently. I figure it'll just give me a good strong cycle and build a robust biofilter.
On the setup progress front, my apex started going nuts. I won't go into all the technical details (there's a thread in the neptune forum), but it arrived at Neptune on Friday so I expect to have it back by the end of the week. Glad it happened before the tank was going, but honestly it's made me a bit jumpy about continuing with the apex system. It's a pretty sensitive application we have for controllers here....
If I'm still not satisfied with performance of the apex during the cycle/seeding process, I'm gonna switch it out to a profilux III. Here's to hoping all goes well, because the pIII with the options I need is not in the budget and I'd would really like the apex to work.
Anyone with experience with both systems?