I looked into that one, as long as it sends out tiny bubbles then it's fine. Doesn't matter what the manufacturer says, what do they know anyway, "good up to 50gl" or any statement like that has to do with you bubble rate more than anything, they just want people to buy 2. With any kind of microbubbler whether it's a machine, glass or a hunk of wood, it really comes down to what you do from there, I stick mine under the filter flow to get the bubbles around more. If they can make smaller bubbles then they're more effective but in my experience they're generally all the same and the glass ones getting algae clogged faster. I used to use glass, now I use blocks, same thing as long as you don't get a crappy block, way way cheaper and easy to hide (my main reasoning). You can find a pack of them at petco for around $5, the coralifes are better than the red sea ones, the latter tends to leak CO2 out of the tubing connector before it gets pushed through the block, and they cost more.
If that thing doesn't send out any bubbles, then it's probably achieving 100% diffusion. If it sends bubbles that are bigger than a pin head, look into something else. If you want to do microbubbles and hide the diffuser, get a limewood block, If you want bubbles and look cool at the same time, get glass, then if you want to go techy, look into those powerhead venturi dealios or an inline reactor.
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