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Discussion Starter · #1 ·
Hi all,

I have a 60cm tank which id not as deep nor high as standard ones and hence is only 27 litres. It is though quite long. Now I have the smallest Eheim external filter with an ADA lilly pipe outflow. It's fine as a filter, but I would like a bit more water moment for the vegetation etc.

Given that this is a small tank, is there any unobtrusive gadget that would do the trick?

Cheers
 

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Use a really small powerhead.
For 27 litres you need something like 20GPH.

85GPH is too mutch for 27L (7 gallon?). I have 200GPH over 110L tank and it's a little too mutch.

You can also add a small air pump or HOB filter.
 

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Discussion Starter · #4 ·
Thanks for the reply.

I don;t know what a powerhead is! Can I get a very small one that is unobtrusive?

Also, what is a HOB filter?

A small air pump is probably an easy solution, but I could only use it at night since I am using H20 injection. So it would have to be pretty silent as I live in a tiny apartment in Tokyo!

What would be the best choice?
 

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HOB = Hang On Back filter.
Powerhead is a type of pump that was originally made to run an undergravel filter. It will have the intake at the bottom and the outlet at right angles to that. It usually has suction cups so you can hang it on any wall of the tank. Just do not get it so low it sucks in the substrate. You could mount it sideways. Some also have a bracket that is adjustable, but hangs the power head from the rim of the tank, and keeps it pretty high up.
A new kind of power head is the Hydor Koralia series. This is more like a propeller in a cage. Works really well. Moves a lot of water but is very efficient, does not use a lot of electricity. Comes in many sizes.

Air pumps are noisy.

An example of HOB filter.
http://usa.hagen.com/Aquatic/Filtration/Clip-On/A595

Here is a link to the Hydor Koralia. This is a small one. (Nano). It comes with a large magnet so you can place it on any wall of the tank. It is a much better mounting than suction cups. The flow is strong enough that if you put it at one end of a 60 cm long tank it would provide some water movement at the other end. But it is not a strong jet like you would get out of a power head.
http://www.hydor.com/eng/prodotti-tecnici/movement-pumps/koralia-nano.php

Here is a link to a more traditional power head.
http://usa.hagen.com/Aquatic/Pumps/Circulation?brand=Aquaclear
 
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