Actually the scallop was in the other tank, which seems to be okay. Saw the feather duster in there again this morning, so a panicked water change in that tank was probably unnecessary.
Sigh of relief, I like that scallop.
I am 90% sure that my tank's crash was due to the amount of livestock in there and as you say, a death or two could cause a chain reaction. Yesterday morning I could literally see worms crawling across every piece of rock, some very large ones. Plus four crabs, three shrimp, and whatever else I didn't even get to see! All in a 13 litre (3.4 US Gallons) tank.
Probably, but see my notes to your answers, you forgot a detail.
My notes on your answers:
1) About 10-11 hours per day on full, with an hour blue in the morning and a couple of hours blue in the evening. -
usually it is recommended that you start the cycle with like limited lighting and then gradually increase.
2) The tanks have lids so there was very little evaporation, only topped off a small amount once. -
I see
3) 3.4G -
really small tank, and you had quite a bioload.
4) Pretty sure it was uncured given how much was in it, but not certain (newbie mistake not asking I guess) -
you'd need to know.
5) Not really, just shook it in the tank when I removed it. So I will probably need to do that this weekend, and start again I guess. -
again literature says to give it a clean in SW and removed anything dead or bad. It's like a once over. Some organisms if exposed to air at all will die, and will die messy. May not have been the actual bioload, but that you didn't remove anything in poor health. Macro algae, sponges, those need to be removed usually.
6) An hour from the LFS store to our house when we got it, wrapped in soggy newspaper, then straight into the tanks and no water changes until the crash. -
again, usually you clean it up a bit.
Thanks for the resource link, I will be sure to do some serious reading!
No problem, it's one of the best I've read.