HARD CYCLING
If there is a standard in cycling a marine tank this is probably it. Get a glass box, put in some substrate, rockwork if you desire, saltwater and throw in a source of organic matter. This organic matter can range from live rock, fish, fish food, cocktail shrimp, ammonia, all the way up to someone urinating in the tank. (Please don’t pee in your tank) After the organic matter has been introduced the aquarist is advised to perform ammonia and nitrite testing to watch for the “cycle”. No filtering, no water changes, no skimmer, no lights, just let it rip. Without regard to the levels of ammonia or nitrite reached the aquarist was told that once the ammonia and nitrite spiked then went back to zero, low and behold your cycle is complete. Do a water change and begin to add critters, usually a small cleanup crew and over the course of the next few weeks they could start to add fish and or corals all the while watching for ammonia to spike again. If it did spike there were of course certain reactions that were needed along with the verbal abuse that sometimes came along with doing things too soon.
Over the history of starting a marine tank it became unpopular to use fish as the source of the organic matter because of the toxic or deadly levels of ammonia that occur in the tank during the cycle. Certainly this was inhumane and torturous to said fish and of course the bashing of new people for using fish began, even though this was the norm in the beginning. After a time It became common knowledge that there was in fact enough of the organic matter needed on live rock to facilitate the cycling process. This led to live rock becoming the standard by which most new people are instructed to start their tanks with.
So capitalism being what it is, retailers dealing in pet supplies see the opportunity here and start to get in large orders of rock from the ocean. Then in an effort to “help” the new aquarist along they begin to sell differing qualities of live rock. Where it comes from does not matter for this discussion but the fact is that you can purchase uncured live rock for one price and cured live rock for another higher price. The difference here being that the uncured live rock is “straight from the ocean, boxed up and shipped to the retailer and available to the aquarist fresh from the ocean water”. Then for some additional cost the retailer will perform some magic to the rock called curing. This entails the retailer keeping the live rock in bins at their facility, cleaning the rock of any decayed matter that has accumulated from the source through the delivery, water changes etc. etc. etc. so that the aquarist gets pure rock with no nasty die-off that may cause an ammonia spike in their tanks. This cured rock has the nitrifying and denitrifying bacteria already in place and can be used in a new setup as a ready to …..um……rock (hee hee) addition to the tank. Of course there is always some amount of die-off even in cured rock that will continue to deteriorate and produce ammonia, however there may be enough bacteria on the rock itself to take care of it. The only thing, in theory, that the aquarist needs to be concerned about is the additional bio load heshe puts into the tank and the subsequent increase in bacteria needed to convert it. All good, all nice using cured rock should help to reduce the amount of time that is necessary to have an up and running marine tank. We’ll just leave it like that for now. So on to the;