I have a bowl in my barebottom tank with small stones to help with BB and also for decoration. I recently read some substrate can get stuck in goldfish mouths so now I'm concerned if I need to get a different kind. The glass figures are about 1" - 1 1/2" (to give an idea of the rock size). Some of the rocks are flat ( you can see one in the second pic behind the blue crab on the left) so now I'm worried they may get lodged in the fish's mouth. What do you think?
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