What powerhead/s to get?

[ashleigh234]

Hi,
I have a 20gallon corner tank, one of the curved ones.
I am looking to buy a powerhead, or two if I am going to need two.
Any ideas on where in the tank they would be best suited and what sort to get? And also whether one would be enough or am I going to need two.
Here is a pic of the tank

 

[sign guy]

what type of tank wil this be? also what type of filtration are you using

 

[ashleigh234]

It is going to have fish and corals, probably 3 fish and a few crabs or snails, and we will slowly build up corals. It currently has the standard filter that comes in the tank, and standard lighting

 

[sign guy]

a maxi 600 and a maxi 900 should be fine

 

[ashleigh234]

If I was to get one, how many litres per hour would it need to flow? And if I was to get two, how many litres per hour would each need to flow?

 

[sign guy]

600lph and 870lph

 

[ashleigh234]

Why two different amounts?
Also, where in the tank would be the best place?

 

[sign guy]

you use two different ph's to create more of a caotic motion in the tank. as far as placement Id start by placing both of them on the side walls twards the back blowing twards the front of the tank, but im sure youll need to move them latter to keep your coral happy

 

[ashleigh234]

We brought one powerhead today, it does 2500 litres per hour and have positioned it in the back blowing towards the front, will see how that works when we get a coral in there

 

[grubsnaek]

well before i got down to the bottom, i was going to recommend a hydor koralia.