The dish on the inside of the crock pot is normally oven safe when it is removed from the electrical part of the crock pot. Obviously the electrical unit itself is not. If the dish is not removable...
You should be able to but for the purpose of just keeping it warm or hot try some of the lowest heat settings first. Leaving it for more than 24 hours may promote bacteria so be careful.
Most of the manufacturers include a statement on the packaging that they are safe for conventional and microwave ovens, as well as the refrigerator and dishwasher. However, the safest thing to do is...
Most likely the answer is no. Fish are opportunist and will take any opportunity they get to eat another fish. If they smaller goldfish can fit in the larger goldfish's mouth than it will get eaten....
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