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Powerhead placement and surface agitation question


drfu

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Im not sure if this is the right forum for this question, I have a new build going and its a 15 gallon column. Im running a stock quiet flow 10, 100 gph, & Fluval 106, 145gph, both agitate the surface but since the width of this column is only 13*13 should i point one of my 3 powerheads towards the top? I have 3 Hydor 240 at my disposal?

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Mr. Microscope

Hmmm... seems like we should have a forum about flow.

 

Anyways, I'd recommend pointing the pumps at each other to create more random movement.

 

Surface agitation is good for O2 exchange, but if you have an efficient skimmer you can do without it.

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Hmmm... seems like we should have a forum about flow.Anyways, I'd recommend pointing the pumps at each other to create more random movement.Surface agitation is good for O2 exchange, but if you have an efficient skimmer you can do without it.

I do not have a skimmer as i don't think i will need it for this small of a tank, 3-4 fish will be tops. I do have the Fluval surface skimmer in transit to take care of any muck on top. Here is a pic if the surface, i could even adjust the return to create more agitation but don't want to create any micro bubbles.

post-82698-0-42843400-1393002253_thumb.jpg

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  • 4 weeks later...
if O2 is inadequate you will have high levels of CO2 which means your pH will be low.

 

When you say Ph would be low, how low? Both of my tanks are between 7.8 when the lights come on and goes up to 8.1 by the end of my daylight cycle. I will also be curious how my levels will change once spring/summer hits up here in the Great White North once i actually get to open a window or two and get some O2 in my home!

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there is your answer, if you have corals that photosynthesize (or algae) then when the lights are on they will be consuming the CO2 and producing O2 which is why your pH is higher during the day, when the lights go off you are relying solely on surface agitation for gas exchange which is why pH is dropping. it's pretty normal to have this drop at night, I dont know enough about it in aquariums to say what would be considered a big drop (in the human body it would wreak havoc though.. lol)

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