gas exchange - Aquarium Advice

hc8719 · 12-05-2006, 11:52 PM

why are gas exchanges so important for sw compared to fw?

tecwzrd · 12-06-2006, 07:43 AM

Because SW doesn't exchange oxygen as well as FW and limited gas exchange in a fully stocked tank can suffocate your fish. That's why we recommend 15+ turnover for tanks with good surface agitation.

**melosu58** · 12-06-2006, 09:51 AM

Quote:

Originally Posted by tecwzrd

Because SW doesn't exchange oxygen as well as FW and limited gas exchange in a fully stocked tank can suffocate your fish. That's why we recommend 15+ turnover for tanks with good surface agitation.

hc8719 · 12-06-2006, 11:04 AM

im sure the 15+ turnover helps contribute to oxygenization. but why dont sw people ever use airators like fw tanks?

tecwzrd · 12-06-2006, 11:17 AM

Because the small amount of surface agitation (where the oxygen exchanges) that air stones create isn't enough movement to create the oxygen levels required in SW but is enough for FW tanks. I still used power heads and strong circulation in my FW tanks personally though even though it was over kill. I never liked having to clean the clogged air stones myself.

Also some deep water corals like sponges can die if exposed to air bubbles.

Water movement alone doesn't create the oxygen which is why it's important to aim your powerheads towards the surface to agitate the surface. If you have an overflow/sump then it's not an issue and you can place your output lower since the action of the water falling will oxygenate your water.

That's also why we recommend topless tanks to keep carbon dioxide from building up which will affect ph levels and keep oxygen from exchanging as well.

**melosu58** · 12-06-2006, 03:15 PM

I definitely agree that surface aggitation is where we get our aeration for SW tanks. I have both my returns at surface level to create as much surface aggitation as possible.

mazilla · 12-06-2006, 03:53 PM

my surface is pretty agitated as well, it makes the light ripple through the water(well the shallower areas at least) and it looks cool.

12-05-2006, 11:52 PM	#1
hc8719 Aquarium Advice Addict Join Date: Jun 2006 Location: Toledo, Ohio Posts: 1,931	gas exchange why are gas exchanges so important for sw compared to fw? __________________ "Atrocities are not less atrocities when they occur in laboratories and are called medical research." George Bernard Shaw

12-06-2006, 07:43 AM	#2
tecwzrd Aquarium Advice Addict Moderator Emeritus Join Date: Sep 2005 Location: VA Posts: 3,152	Because SW doesn't exchange oxygen as well as FW and limited gas exchange in a fully stocked tank can suffocate your fish. That's why we recommend 15+ turnover for tanks with good surface agitation. __________________ -Micah- If you haven't figured it out yet I like to BOLD links :P Vote for AA at Aqua Rank

12-06-2006, 11:04 AM	#4
hc8719 Aquarium Advice Addict Join Date: Jun 2006 Location: Toledo, Ohio Posts: 1,931	im sure the 15+ turnover helps contribute to oxygenization. but why dont sw people ever use airators like fw tanks? __________________ "Atrocities are not less atrocities when they occur in laboratories and are called medical research." George Bernard Shaw

12-06-2006, 11:17 AM	#5
tecwzrd Aquarium Advice Addict Moderator Emeritus Join Date: Sep 2005 Location: VA Posts: 3,152	Because the small amount of surface agitation (where the oxygen exchanges) that air stones create isn't enough movement to create the oxygen levels required in SW but is enough for FW tanks. I still used power heads and strong circulation in my FW tanks personally though even though it was over kill. I never liked having to clean the clogged air stones myself. Also some deep water corals like sponges can die if exposed to air bubbles. Water movement alone doesn't create the oxygen which is why it's important to aim your powerheads towards the surface to agitate the surface. If you have an overflow/sump then it's not an issue and you can place your output lower since the action of the water falling will oxygenate your water. That's also why we recommend topless tanks to keep carbon dioxide from building up which will affect ph levels and keep oxygen from exchanging as well. __________________ -Micah- If you haven't figured it out yet I like to BOLD links :P Vote for AA at Aqua Rank

12-06-2006, 03:15 PM	#6
melosu58 SW 10 yrs and over Community Moderator Join Date: Oct 2004 Location: Richmond Va Posts: 12,692 Images: 80	I definitely agree that surface aggitation is where we get our aeration for SW tanks. I have both my returns at surface level to create as much surface aggitation as possible. __________________ View My Tanks http://i71.photobucket.com/albums/i1...8/melosu58.jpg Click here to Visit FantasyReef

12-06-2006, 03:53 PM	#7
mazilla Aquarium Advice Regular Join Date: Nov 2006 Posts: 97 Images: 11	my surface is pretty agitated as well, it makes the light ripple through the water(well the shallower areas at least) and it looks cool.

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