Quote:
Originally Posted by JDigital
Sand was fully Live when added.. and the tank would have had a solid 3 weeks to seed from the sand... Inverts were added end of 3rd week... I think there was enough to build up the proper cycle.
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Live sand may help a cycle by supplying some bacteria but it's not enough and a cycle can take up to 6 weeks. You obviously had the right bacteria in there I just don't think enough was built up to support two fish at once. Remember it's a 10 gallon tank, it's the same as adding 10 fish at once to a new 50 gallon. Seems obvious to me what the issue was. Hermit crabs will survive almost anything and they can't supply enough waist to produce the bacteria needed for fish.
Not trying to argue here, just get to the bottom of your issue. I mean what else could it be?