I'm new to keeping fish. I picked up 3 comet goldfish a couple of months ago. They've been living in the same tank and one is getting bigger, way bigger than the other 2.
Is it pregnant? How can I tell?
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Hmmm, it is a little diifcult without a picture to really determine that your goldish is pregnant or not... but if it seems like it's belly is getting big, then it might be.
If your goldfish is getting big overall in length and height, etc. that is natural since comet goldfish do end up getting pretty big!
I recommend taking a read here for best practices in the case that your goldfish is bearing baby fish!