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Old 07-20-2010, 04:51 PM   #1
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Hi there guys

This is my first post and I was wondring if you could help me. I have a 125 litre tropical tank. My pump went wrong which was a Fluval U3. My partner went to the store to get me a new one and came back with a Fluval U4. The guy in the shop said that even though it was a pump for a bigger tank (130 - 240 litres) that it was fine (they didnt have a U3).

The pump has been in there a while and i've never been able to get rid of all these little bubbles!. I don't think its hurting the fish. Its just really annoying. Is there any way I can get rid of these bubbles?? Is it because the pump is just to powerful for the tank?

Any advice would be much appreciated.

Many thanks


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Old 07-20-2010, 06:02 PM   #2
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Welcome to AA. is it sucking in air and spitting out the bubbles? not sure what a u3 is we dont have that model here.

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Old 07-21-2010, 12:53 PM   #3
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Welcome to AA!

I'm pretty sure the U-series from Fluval are in-tank underwater filters. I don't know much about them, but I've seem them around.

Describe the bubbles please.
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Old 07-21-2010, 02:16 PM   #4
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Have you tried changing from Top Spray to Middle or Bottom?
Based on the YouTube video it appears that Top spray has lots fo bubbles.

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Old 07-21-2010, 03:34 PM   #5
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It sucks in through the bottom and out through the top. U3 is the smaller version for smaller tanks. I will check out the video thanks. The only thing i can say about the bubbles are they are very very small and theres lots of them!

Thanks guys
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Old 07-21-2010, 06:24 PM   #6
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Welcome aboard.

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bubble, bubbles

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