"Mary" wrote in message
...


Anyway, I have a two month old 12-gallon tank (yep I'm a newbie) and all
I've got is one goldfish in it. When I woke up this morning, there was a
cloudy white substance on the bottom that's a bit see-through.

It looks like mold to me, but what do I know?


Without actually seeing it, I'd have to hazard that it's uneaten fish food,
and it is rotting. Remove as much of the debris as you can, and do an extra
water change, using conditioned water.
Then, drasticly cut the amount you feed your fish. Once per day, no more
than the fish will completly consume in 2-5 minutes.
What kind of filtration do you have on the tank?
Also, you should be aware that a 12 gallon tank is too small for a
goldie, and his growth will eventually be stunted, and he will likely die.

http://faq.thekrib.com/begin.html Beginner's fishkeeping FAQ.

hth

billy