Flow Rates

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Have recently set up a small reef tank (130L) and the just introduced the first inhabitants. With some food going in and detritus being stirred up it is obviously much easier to see the flow patterns and spot the dead-spots! From reading around it's clear I should aim for at least 20x flow but probably heading up towards 50x(plus) for SPS (which I hope to add a few of at some point in the distant future!)

2 main questions ...

1) Should I include the flow rate for the circulation pump in these calculations?
2) Are there any guidelines as to a maximum  flow-rate/ things to look out for to know when you have over-done it? (I have plenty of powerheads from when I had tanks a number of years ago but seems a little overkill to stick them all in a relatively small tank!)

Any advice very much appreciated

Amo Manik

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Reply #1

Hi do you have a sump?

mightyhatter

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Reply #2

Unfortunately not, no. Have set up an old Red Sea 130D with the built-in filtration section at the back

Thanks:


Animal

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Reply #3

Hi mate ,
Answer to question 2 is easy ,if everything is squashed up against the glass and can't move off it then you've got to much flow
 lol
Sorry couldn't resist that ,
Dave
 8D

Animal

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Reply #4

You sort off have answered you're own questions,
Read what you wrote ,
I'd include all flow rates in the equation,start of with what you consider minimum rate ,if you feel you need a bit more then add to it ,bit tricky this one ,only you will know by the way things react in the tank ,we obviously can't see what's going on so we can only go on what info you give us,but I'd say start low and add see how it works out.
Sorry can't be much more of a help ,
Dave
 8D

Animal

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Reply #5

If it's just the detritus that's blowing up then fine but if you're blowing the substrate around as well
Then probably to much or redirect the flow if you can ,just one way of telling .
Good luck with it ,maybe post a video so we can all see what's happening that would help everyone to
Give a guided answer for you ,
Dave
 8D

mightyhatter

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Reply #6


I am testing out the various options but the thing I can't seem to find any clear guidance on is the inclusion or exclusion of the circulation pump in the calculations (as it can have quite a big impact)

At the moment I have the circulation pump kicking back into the tank at c.1500 L/h and a koralia (3200 L/H). That works out at either 37x (if the circulation pump is included) or 25x (if I just consider the Koralia). It makes quite a difference if you are meant to include the pump or not!


Because there is only a single koralia the flow is going in one main direction across the tank (the pump return has limited direction options, and because it is a direct stream it does kick up the substrate if mis-directed). As a result there is a little bit of a dead spot at the side under the koralia and in the back corner behind the rocks. I have pretty much decided to add a second koralia on the opposite side of the tank to remove the deadspots and increase general flow, however the size if the main question...


I have another one which shifts 3200 L/H - this would result in 61x (circulation pump included) or 49x (just the koralias). I'm slightly worried this could be too much flow. The other option would be to buy a nano-Koralia which moves 900 L/H and so would be a bit more gentle but should do the job I need (but is buying more kit rather than using some of the piles of stuff I already have in storage!).


I will probably try the 3200 L/H tonight to see how it goes!

Animal

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Reply #7

With mine for example ,
I've got 180 litre tank ,I've got the internal filter pointing towards mid front of the glass,I also have a tunze wavemaker pointing towards just off centre towards the front and the amount of flow I get is plenty enough to circulate ,
Dave
 8D

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