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These flat disks sit perfectly on the gravel without floating away, and they create a really nice, even curtain of tiny bubbles. My tank looks so much more alive and the water circulation seems noticeably improved.

I just set these flat disks under the gravel, and the fine bubbles rising up really improve oxygen flow across the whole tank. The column of air is very even, which keeps my betta swimming calmly without strong currents.

The bubble stream is noticeably more uniform than with a standard stone, making the tank look nicer. I had to fiddle a bit to get it to stay flat on the substrate, but once positioned, it stays put. Good for gentle aeration in a smaller aquarium.