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Fluval U2 current suddenly strong.
May 20, 2015
3:03 pm
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Gaina
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March 8, 2015
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Yesterday I did a 10% water change and checked the biomax and sponge trays on my Fluval U2.  No settings were changed and it's on the B position for the gentle spray bar.  When I was all done, I switched the filter back on and the plants seemed to be moving a lot more.   This morning my fish seem a bit obsessed with the spray bar and are swimming into the flow or congregating on the right hand side of the tank (the filter is on the back of that side, with the spray bar facing left).  The opposite side of the tank is more heavily planted with amazon sword and a creeper as you've seen my other photos so I don't know if that's a factor.  Is there a way to control the flow that I haven't figured out yet?

 

 

 

 

May 20, 2015
6:23 pm
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Byron Hosking
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I've not used this filter myself, but from the data online there are apparently three flow settings, so presumably you have a higher setting now.  You may be able to turn this down.

Another trick that works is to aim the flow into the end wall closest to the filter.  If for example the filter is placed along the rear wall in or close to the right side, aim the flow into the right end wall.  The flow then hits the wall and disperses down the tank with less force.  With a spray bar, attach this along the side wall and into the glass.  By adjusting the angle of the holes you can usually balance a good surface distrubance with adequate down-wall flow.  This can help even with less initial flow; many fish do not need or appreciate strong flow, as they are continually fighting it and this wears them down.

Fish will naturally swim against the current.  Not only is this mandatory since they cannot swim backwards, but it is the only way to avoid being swept away.  Also, food naturally comes to them in the current.  And sometimes they just seem to like the exercise.  The problem arises when they cannot really get out of the current, to rest.

Byron.

Byron Hosking, BMus, MA Vancouver, BC Canada
May 21, 2015
7:15 pm
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Gaina
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Forum Posts: 43
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March 8, 2015
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Byron Hosking said
I've not used this filter myself, but from the data online there are apparently three flow settings, so presumably you have a higher setting now.  You may be able to turn this down.
Another trick that works is to aim the flow into the end wall closest to the filter.  If for example the filter is placed along the rear wall in or close to the right side, aim the flow into the right end wall.  The flow then hits the wall and disperses down the tank with less force.  With a spray bar, attach this along the side wall and into the glass.  By adjusting the angle of the holes you can usually balance a good surface distrubance with adequate down-wall flow.  This can help even with less initial flow; many fish do not need or appreciate strong flow, as they are continually fighting it and this wears them down.
Fish will naturally swim against the current.  Not only is this mandatory since they cannot swim backwards, but it is the only way to avoid being swept away.  Also, food naturally comes to them in the current.  And sometimes they just seem to like the exercise.  The problem arises when they cannot really get out of the current, to rest.
Byron.

Thanks Byron, they are using the rest of the tank now, they are eating well and there are plenty of places where the Amazon Sword provides shelter from the flow and I've noticed this is where they go at night.  I think I'm probably just being a bit parnoid that I've done something wrong, being new to all this.  Anyway, their colours are coming out beautifully now and they seem to have settled down.

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