First Picture Filter intake - Just curved it to fit inside and also a small circle for the bottom. Yes I would wash it first in really hot water to make sure it's clean. I use a little piece to slow down the water flow from the outflow which I can move up and down. I put an extra input filter piece inside my gravel vac, just incase, my frogs follow me around when I have to do anything in the tank. The bottom 2 photos are what my frog looked like when she has gas.

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