Cycling a large tank?
 

My 190g will be ready for water in a few weeks (I hope). I was wondering about the cycle for a tank this size. Is it more important with larger volumes of water? Or because there is so much water is the cycle not a concern? When is it safe to add all the LR I need and the fish, corals, and inverts from my 30g?

your likly to need more LR for the bigger tank right? I would cycle this new rock like you would or did your 30G. Make sure nitrites and ammonia are zero then add everything from the 30G

Do a search online for Fishless Cycling. I used this method on my tank and I was adding livestock in about three weeks without any deaths. Half of the sand and about 100lbs of live rock that I used was already established however which does help considerably.

I would put all of your LR (minus what is in your 30g) and cycle that for a month to 6 weeks. Then slowly add your LR, fish etc from the 30g over a period of a month or so. By adding your fish etc over a period of time you will avoid overloading the bioload in the new tank which could lead to a crash or mini cycle.

Cure your new LR in a separate container, not in your new tank. Once it's cured, put the LR in the new tank. That way, all the crud and nutrients stay in the curing container and you won't have to do any large water changes to bring down nitrate and phosphate.

Does all LR need to be cured? I thought most of the stuff at the LFS was cured already. I could put it in a large rubbermaid, would it need to be heated? How long does it take to cure? I plan to use some base rock too, is there anything that needs to be done with it before it goes in the tank?

Thanks

Most LR from LFS are NOT cured, unless there is a sign that specifically states that it is cured. Stores know that they can charge a premium for cured LR, but most places don't have the tank space to cure 100s of lbs of LR. Cure in a separate container & it'll save you effort & money (less salt wasted). If you keep you bioload/fish numbers low for the first few months, you can cure a bucket of LR at a time, so it's not such a shock to the wallet to buy over 100 lbs of LR in one shot. General rule of thumb is 1 lb/gallon of volume.

Base rock, btw, takes several months to become "live" & if its not porous, I doubt it will ever be more than decoration in a sw tank. After all, the bacteria live within LR, not simply on the surface.

Anthony

As Anthony states, most LR will not be cured. You will need to have great circulation and a heater when curing LR in a rubbermaid or other container. The LR will take up to six weeks to cure. When you have no detectible ammonia or nitrite, your rock will be cured.

Here's my page on curing small amounts of LR. For larger amounts of LR, use a larger powerhead than described in the article.

I also read in an Aquarium Fish magazine that when you're adding new water to a tank for the first time, RO water may not be the best choice. They recommended tap water since some levels of phosphate, nitrate, and ammonia need to be present in order for the tank to cycle properly.

You'll still get some nutrients added to new saltwater when the cured LR goes into the tank. I would only use RO water for any new tank. Also, new saltwater does not have to be "cycled" before the cured LR goes into it. The cured LR will cycle the tank pretty quickly.

One more thing, there is no need to fill the display tank with new saltwater until a day or two before putting in the cured LR. Cured LR can stay in the curing container for a week or two while you're filling your tank. There is no need to hurry along the process.