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Old 11-20-2013, 10:53 PM   #11
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Most sponge powerheads will have an option to attach an airline to them so air will be blown into outake. I always use an airstone, not because im sure i need to but because im not 100% sure i dont.

Powerheads should be completely silent.

Fish die belly upward and rise to the surface. It's their way of falling.

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Old 11-20-2013, 11:03 PM   #12
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Well like I said I haven't used air stones in years.I have two powerheads plus the main pump moving the water in my 90 salt and I think my fish are as healthy as anyones so take it from there.

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Old 11-21-2013, 08:00 PM   #13
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Originally Posted by BBradbury View Post
Hello Cal...

I'll take a shot at your question. Airstones are mainly for show. The tiny bubbles have no surface area, so when they rise to the top, they make tiny waves that really don't do much to mix oxygen into the tank water and allow carbon dioxide to escape (gas exchange). Even a lot of tiny bubbles don't do much. It would be better to remove the airstone and place the end of the plastic tube at the bottom. The much larger bubbles will move the surface water and create the surface movement you want.

You don't need the airstone. A good power filter with a gallon per hour rating (gph) of 4 to 6 times the volume of your tank in gallons is all you need. Add large, weekly water changes to the mix and your fish and plants will be healthy.

I agree with BBradbury. I believe they are purely cosmetic in your main tank but are used in fry tanks and hospital tanks. It's completely personal imo, some people love them, some hate them. It's the pump that does my head in!!

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