I miss the AC that let you call an idiot, an idiot, when they were being an idiot. That's not directed at anyone in paticular, just a general nostalgic statement... :dance:
I wasn't around for that, but this thread and several opinions posted within it make me yearn for the same thing. People post nearly everyday about buying a tank and throwing fish in, fish dying, and not testing or doing water changes. Someone posts, follows advice, buys a kit immediately, tests multiple times a day, does massive water changes, gets used media, etc. and they get chased off by the "my way or the highway" approach. Pretty sad state of affairs. Perhaps you should read more of the FW Newbie threads to chase them off.
No one ever said "my way or the highway".. But when you see someone do something so blatantly stupid as throwing more fish into a cycling tank, it's kind of tough to remain positive about that person's chances at ever being sucessful when they can't/won't even follow basic instructions.
4 tetras into a 46G tank that has been cycling for a month and has recently had heavily loaded media added to it is not "blatantly stupid". Allowing the bacteria introduced in the media to die off due to a lack of food source (ammonia from wastes) would be.
AND, the OP DID follow basic instructions to get a good test kit, test daily, do water changes, get media, etc. There would be a heck of a lot less dead fish if more newbs showed that level of commitment.
Certainly it can, but squeezing a sponge into the tank ain't the same as throwing a piece of used driftwood or a bag of gravel in the tank. The bacteria we care about aren't even in the water column. You can't cycle a tank by using water from another tank. You can HELP cycle a tank that way, but you cannot simply transplant a cycle via water. If I moved the canister filter, all the gravel and driftwood in my 75g into a brand new 75g, I'd still expect a mini-cycle due to losing all the bacteria on the tank glass.. If I just moved the water, then I'd expect a full blown cycling event.
katuuuz, whomever told you "you can just seed it into other tanks." didn't explain it to you properly. You can seed as many tanks as you want, but seeding is simply that, a seed. Until that seeding grows enough to handle your bioload, you aren't cycled.