Tony, the rock is so nice that I need to chance it. If it goes wrong, I will order a fresh box of rock. I have added some of this rock to my existing tank, and no issues, so I'm hoping

last time when I add 40# of dead rock in the 210. everything went downhill fast!

However, if you have the time to treat and cure the "not so alive" rocks, you will probably be ok.

You have the zeo stuff, so why don't you do the 14 day zeo cycle in the bucket? Take a few pounds of 'good' live rock and do the 14 day job. I did that you months ago when adding 100 lbs of dead rock to my system and it worked very well!

I added about 20 to my 180, no issues at all. No localized algae, etc.

You'll need to remind me what the zeo 14 day thingy is!

Hey Brad. I just used the 14 day zeo cycle as well and it has worked very well for me. However I had my dry rocks soaked in a tub for over 3 weeks prior to using this method.

Here's a link that explains it step by step.
http://www.korallen-zucht.de/en/serv...-just-14-days/

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Thanks, I'll have a read.

Emphasis on adding fish slowly from day 10 on makes this not ideal. At best I can stretch it a week, maybe.

I've actually didn't like that step as well because I was transferring from an old tank just like you. I think that's just to get the cycle kick started etc so the rocks can slowly get use to the bioload. Maybe if your cycling it in a tub or bucket you can throw a few of your smaller fish in there just to get the bioload kick started once the 14 day is completed you should be able to add more fish in quickly. At least this has worked for me. My no3 and po4 are still in check and after 14th day there's not much left for algea and diatoms.

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I'll try that. The rock will soak for 3 weeks anyway, then go into the tank. I'll cycle it there with the zeo, but fish will all have to go at once. There's no catching fish without draining the tank.