More surface agitation in my 35G? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 01-22-2013, 09:06 PM Thread Starter
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Question More surface agitation in my 35G?

Hi all,
start off with the gear...
- 35 gallon heavily planted (see link in signature)
- Eheim 2213 ins/outs bulkheaded to back of tank
- inline Hydor heater
- CO2 forced; 5lb tank, Green Leaf Atomic Regulator, Archaea small ceramic diffuser
- water parameters are all normal (0 am, 0 trite, ~5 trate)

So i have the output of my eheim, rear right center of tank (should be able to see by clicking link in my signature), pointed down and toward the CO2 diffuser to help spread the CO2 bubbles move around the tank. However because of that I really don't get much surface movement/agitation. My question is would my inhabitants (11 Harlequin Rasboras, 6 Weitzmani Corys, 2 Amano Shrimp, 2 Nerite Snails, 2 African Dwarf Frogs) benefit from either an airstone or powerhead to get some more surface agitation and O2 going? They seem ok but lately the rasboras do seem to be "chomping" quite a bit. I'm not sure if its them breathing heavy, it looks more like they are chewing.

My second question is will adding the airstone or powerhead decrease my CO2 volume? I've read a number of places that surface agitation decreases CO2 levels. I get a lot of pearling and my DC hits lime green at about 1 bubble per second, so I definitely have room to increase it.

Lastly any powerhead reccomendations for a 35G?

Thanks in advance!

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post #2 of 2 (permalink) Old 01-22-2013, 09:39 PM
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Your fish will rush to the surface of the tank and gasp for air if the water is over-saturated with CO2. They will also hang out near the surface of the water where the O2 concentration is the highest. If you don't notice these symptoms then you should be fine.

Adding an airstone will decrease your CO2 levels. I won't go into the science of how bubbles from air stones affect O2 levels because you mentioned surface movement/agitation which means you already are aware of that. You can run your CO2 during the day and run your air stone at night when the tank lights are out. Plants do not photosynthesize without light so the CO2 output during dark hours isn't being used efficiently. The only thing you should watch out for, if you decide to alternate CO2 and airstones, is pH swings caused by the addition and removal of CO2.

Last edited by 2Shi; 01-22-2013 at 09:39 PM. Reason: .
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