adding airline to venturi outlet on internal filter? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 8 Old 11-30-2011, 01:03 PM Thread Starter
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adding airline to venturi outlet on internal filter?

I have an internal power filter which also aerates the aquarium through a venturi outlet. I really like the idea of an air stone. Can I attach an air line to this venturi outlet like you would an airpump? Is that a dumb question? Is the top part of this filter an air pump? It has an outlet which powers the water round the tank and it says on the box "powerful aeration". If i want an air stone would i have to get a small air pump? Also i want to get a betta and i know they like still calm water. Would an air stone be a bad idea then?
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post #2 of 8 Old 11-30-2011, 02:34 PM
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The venturi effect here refers to being able to use the movement of water through shaped pipes to pull air into the water flowing through the pipe dude to negative pressure. So Basically it acts as an air pump, but what you are referring to as the output is actually the input for air to enter. Which means this input needs to be above the water line so it can draw air in, if its not already above the water line then you should be able to add a small piece of airline tubing to allow it to be the right height.

So basicly you do not need an air stone or air pump, if the filter is working as it says it does then it is already aerating the water as it passes through the pump. If you want an air stone in the tank then you will need to purchase an air pump for that to work.
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post #3 of 8 Old 12-01-2011, 05:40 AM Thread Starter
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Ah right, if i put it above the waterline its real noisy and totally disturbs the surface of the water so i have it at the bottom, which i guess is just circulating the water then? The box says its not necessary to have it at the top for the filter to work but does that mean then that my tank is not being aerated? The venturi is very powerful and it has a switch on top which is supposed to switch it off, but doesnt seem to. I have 3 live plants which are growing well so that should help with oxygenating the water but would it be a good idea to get a small air pump and air stone as well? Do you have one? Will that be very noisy and disruptive like the venturi? Would just like to make sure fish are happy and a single small airstone would probably make a nice focal point.
Its a small community tank, 48 liters/12 gallons.
3 Balloon mollys
6 cardinal tetras
in the future...2 panda corydoras and 1 male betta
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post #4 of 8 Old 12-01-2011, 02:51 PM
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Its hard to say with out seeing the filter what is going on, but inorder to aerate the water it needs somewhere to pull the air in under the water. Do you have a link to the filter, that will tell me more. I'm not going to comment too much on your stocking and will leave it for other people but I do believe there will be some fin nipping/compatibility issues there. As for if you will need an air pump its all going to depend on the filter.
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post #5 of 8 Old 12-01-2011, 03:17 PM Thread Starter
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Interpet Internal Power Filter PF1 Internal Aquarium Filters for Sale

Here's a link to see the filter I have.
And you think my stocking isn't good? I am surprised, what/who is not right? I researched this so much!
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post #6 of 8 Old 12-01-2011, 05:24 PM
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I cant find any good diagrams on where the air valve is on the filter so can't comment to much more on that but for aeration to occur the air hole should be above the water line, and like you were talking about you can supplement this with an air pump if the filter is too noisy. And would be recommended as you are going to have a good stocking, just make sure the flow isn't to much for the betta.

As for compatibility, I was wrong about the fin nipping but according to the fish profiles, the Cardinal Terta need to be kept it acidic water for optimal health while your mollys will need basic water. Panda corys as most corys should be kept in a group of 3 or more. And just a little nervous on adding a male betta to any community tank, the betta people will be able to better advise you on that though.
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post #7 of 8 Old 12-06-2011, 06:06 AM Thread Starter
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Thanks, sounds like you know your stuff, I now have two tetras left! EEK! How about I give up with getting more tetras now- I've lost 7 in total! I just had some water quality issues which I realized was caused by too much decoration in the tank, I had a plastic log which was too big for the tank, so have removed it now and replaced my filter foam and the water has finally returned to clear. Test kit arrived in the post yesterday and all is fine now, thank god!
For the stocking then, how about
3 male balloon mollys(already have)
3 male guppys
3 panda cory doras
Plus I obviously still have two tetras, but they seem to be happy, swimming together and playing.

I know the guppys are ok with harder water, which unfortunately is what I have where I live.
Whats your thoughts?
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post #8 of 8 Old 12-06-2011, 03:02 PM
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Sounds about right and you will be right at your top stocking level for a 12 gallon tank keep up on your water quality tests, that will tell you if you need to make changes in your stocking.
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