I've had a couple of gold mystery snails for about 4 months now. I'm not sure of the exact species, but they are a bit over 1", deep yellow shell, light yellow flesh, and pink/red eyes. After looking at applesnail.net, I'd say I probably have Yellow Pomacea canaliculata.
A little over a month ago, one of them laid eggs, and about 3 or 4 weeks ago, about 120 baby snails hatched. Initially they were all pale yellow. But now some are either changing colors, or I have a new snail infestation. Here's a recent picture:
The snails in this picture are about 3/16th on an inch in size. From what I can tell, their shape is the same as the yellow baby snails, and so is their behavior. The only other grown snails I have are nerites I got 2 or 3 weeks ago, and a few MTS isolated in a different tank. Any idea what these snails are?
BTW, I'm certain these are not just baby snails that were born brown instead of yellow and I didn't initially notice. The yellow snails were born in a tank with black gravel. I siphoned about 80 of them out with 3/16th hosing, so I know I was only grabbing yellow ones. If there had been any brown ones, I would have easily seen them in the container I siphoned them into. The snails I siphoned out I moved to 3 other tanks, and I'm seeing the brownish snails in all 3 of these thanks now.