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Discussion Starter · #1 ·
I'm exploring my equipment options as I prepare to move from a 55G tank to a 5G nano. I currently have a Rena Filstar XP2 on the 55G and I was thinking of using it on the 5G. Obviously as is, the current is way way too strong for a 5G, but I was thinking of adding a bypass valve between the inlet and outlet tubing close to the filter. That way I can open or close that valve to increase or decrease the amount of water that bypasses the tank and simply get's recirculated in the filter between the inlet and outlet tubing. That way I can reduce the flow without putting lots of back pressure on the pump.

Does that sound like a good idea? The only thing that I can think of that might be a problem is oxygen depletion in the water that's being recirculated since there will be about 2/3 of the water flow that would go thru the filter a handful of times before ever making it to the tank to get oxygenated all the while bacteria are using the oxygen in it.

Thanks,
Harry
 

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sounds possible.. just make sure you don't stop the flow alot on the outlet side.. the canister starts making weird noises.

i have 2 XP2's on my 18g. :confused1:


I'm exploring my equipment options as I prepare to move from a 55G tank to a 5G nano. I currently have a Rena Filstar XP2 on the 55G and I was thinking of using it on the 5G. Obviously as is, the current is way way too strong for a 5G, but I was thinking of adding a bypass valve between the inlet and outlet tubing close to the filter. That way I can open or close that valve to increase or decrease the amount of water that bypasses the tank and simply get's recirculated in the filter between the inlet and outlet tubing. That way I can reduce the flow without putting lots of back pressure on the pump.

Does that sound like a good idea? The only thing that I can think of that might be a problem is oxygen depletion in the water that's being recirculated since there will be about 2/3 of the water flow that would go thru the filter a handful of times before ever making it to the tank to get oxygenated all the while bacteria are using the oxygen in it.

Thanks,
Harry
 

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Discussion Starter · #3 ·
sounds possible.. just make sure you don't stop the flow alot on the outlet side.. the canister starts making weird noises.

i have 2 XP2's on my 18g. :confused1:
2 Filters on 2 separate 18G tanks, or 2 filters on 1 18G tank? If it's two filters on one tank, how much current are you seeing? Any reason why you went with two of these filters on one tank? Did you restrict the flow on the filters or are they going full blast?

Thanks,
Harry
 

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Restricted flow. Stuffed the canisters with cotton like stuff you get in a bag at the pet store along with the pads that were in them. Leave the charcoal out.

I'm using both XP2's on the 18g at about 75% flow. (using the inline adjuster). Anything more the canister starts bubbling or making weird tapping noises.

Flow looks great. Steady back and forth sways from the stems etc.

If you want to reduce flow some more, try to aim the outflow at a side of the tank and bounce it. I have both outflows on each back corner of my tank, facing to the opposite diagonal from corners.

No real reason getting 2 XP2's. I figured I should double it up with keep with my scheme for the tank. It's a 18g hightech tank with 4x24w t5HO.
 

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sounds like an overkill on a 5g.


i was using an Eheim 2215 on my 10g, and took it out after a day. too much flow, to big, yatta yatta.


why not check out those ZOOmed, nano turtle canisters?
 

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I'm using both XP2's on the 18g at about 75% flow. (using the inline adjuster). Anything more the canister starts bubbling or making weird tapping noises.
I don't own an xp but do they adjust flow on the input?

With the Eheims you don't want to restrict flow on the input, it will cause unnecessary strain to the motor and cause cavitation. Only use the output side for flow reduction.
 

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Discussion Starter · #8 ·
sounds like an overkill on a 5g.


i was using an Eheim 2215 on my 10g, and took it out after a day. too much flow, to big, yatta yatta.


why not check out those ZOOmed, nano turtle canisters?
I've looked into them, but it sort of hurts to sell an XP2 and get just about enough money to buy a Zoomed 501 ... I'd rather keep the large XP2 and use it somehow. :)

Harry
 

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Discussion Starter · #9 ·
should be fun with the xp2 on a 5G ..!! whats the point of restrict the flow of the filter for? just run it max or dont run it at all get another filter for the right size!!
There's actually a handful of reasons to use a large filter on a small tank, if you can adjust the flow. For one, the larger filter will get proportionally less dirty and require cleaning less often. Also since it's being put on a small tank, the added volume actually makes a difference (ie: adds about 15% to 20% to the total water volume).

Thanks,
Harry
 

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I have an XP3 on an 18G (ADA 60P) and modified the flow adjuster to make it work on my setup with lily pipes (I just sawed off one end of the flow adjuster)... works like a charm... for the outflow it goes

flow adjuster
inline diffuser
inline heater
outflow lily pipe
 

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I have an XP3 on an 18G (ADA 60P) and modified the flow adjuster to make it work on my setup with lily pipes (I just sawed off one end of the flow adjuster)... works like a charm... for the outflow it goes

flow adjuster
inline diffuser
inline heater
outflow lily pipe
That's exactly how I have mine setup too for 1 of the XP2. Except I'm thinking about adding a chiller to it now.

The adjuster is on the outflow (previous post)


I just cleaned out both XP2's and the put the flow to wide open for giggles. It looks kind of cool with the plants swaying in the background :flick:

spilkeit, Newton?? What part? We can be ADA 60P friends haha
 

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keep the filter more water volume is a definite plus and less o2 means more co2.......... and lower the flow by adding a sponge on the inlet and get the zoomed 501 sponge its the perfect fit on most intakes and its black very fry,shrimp friendly
 
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