Quote:
Originally Posted by troni
You need live rock to seed your base rock. Live rock has a lot of beneficial bacteria and life in it your not getting any other way. I'm not sure if you can have fish in it yet. Someone with more experience than I will chime in.
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I have just over 200 pounds of marco rock, which starts off dead as moon rock, but it can be cycled just like any other filter. It's true that live rock is generally better, but it's also notorious for bringing in pests and nasties. My last tank was pretty much ruined by an aiptasia plague that got out of control, and I'm going to do everything possible to prevent that from happening again.
The bacteria families that turn ammonia into nitrite and then nitrite into nitrate are ubiquitous in the environment, they're on your skin, on the ground, generally in the ether. If you fill up any vessel of water (fresh or salt), provide some flow, a surface for them to colonize, and a source of ammonia, you will eventually get a functioning nitrifying bacterial filter - assuming you're not starting in a completely sterile environment that is. However, that takes a long a$$ time without help, as you need to wait for an initially tiny starting population of bacteria to expand enough to measurably process waste. That's why there are products that claim to add large populations of the desirable bacteria from the start to get things going, like Dr. Tim's and Prodibio start-up. I did add 250ml of Dr. Tim's when I started, and I think it probably got me over my ammonia hump a few days earlier than it otherwise would have, but it didn't seem to help one lick with the nitrites. Maybe all the nitrite eaters in the Dr Tim's starved to death before there was enough in the water for them to consume or something.
Either way, you can get a biological filter that is totally appropriate for both corals and fish without ever adding any real 'live' rock, it just takes waaaaaaaay longer for things to stabilize.
What you don't get any of with a freshly cycled tank full of previously dead marco rock, is anaerobic denitrifying bacteria in the deepest pores of the rock that take nitrates (the end process of nitrification) and break it down into nitrogen gas. So in my case, my nitrates will continue to rise until I find some other way of removing them. You also don't get any of the small nearly borderline microscopic crustaceans and worms that fill the ecological niches between the fish and the bacteria, or any of the micro and macro algaes that add nitrogen fixing capacity, diatoms, fungi, viruses, or much diversity in bacterial populations that works to keep things stable. Basically, you have a filter, and not an ecosystem. For that you need an outside seed source, which is why I added a small piece of really fresh rock from a local store (it hadn't even finished curing yet) so that I could kick start the diatom bloom that every tank goes through. I only got a tiny piece because I've been burned before and I don't trust any rock that's spent time in a large, retail rock holding facility, as those places are literally aiptasia factories. Lo and behold, this one sprouted aiptasia within a week of going in my tank, so it was turfed. It was enough time for the diatoms to do their thing though.
What I will be doing to create the 'ecosystem', is adding 50 more pounds of live rock from Walt Smith that is being ordered for me directly from Walt Smith. That is to say that the rock I'll put in my tank will have not touched water between leaving Walt Smith's facility, and going in my tank. It will be uncured when I put it in, which is why I've heavily pre-cycled 200 pounds of marco rock, which will, fingers crossed, be enough of a filter to keep ammonia levels in my tank down while the walt smith rock cures, which will prevent as much extra die-off as possible.