How much flow?

[BCReefer]

Hi all,
I'm in the market for an inexpensive powerhead to try and take care of an algae problem. How much flow would you guys recommend? I currently just have 1 powerhead feeding my in-tank skimmer, it has 2000 L/H (about 500 GPH), but I doubt there's still that much flow coming out after it goes through there. There's about 50Gal in the tank so that's only 10 gal/h of flow.
So what size should i be aiming for when buying another powerhead/wavemaker? I was thinking of adding 1 more with about 320 GPH and stick it on the other side of the tank. The LFS guy said adding 250 or so would be a good help. Advice? General GPH rule to follow?
Also, I have no UV in the tank and have been reading good things about them, I saw this inline UV light that hooks onto powerhead intakes and does what it does. Anyone have experience with them? I know my no-sump setup is a bit cheap but my nitrates, phosphates etc are never very high and its all nice and small and contained.

Here's the UV light
Inline/Powerhead option Aquarium UV Sterilizer (3 Size) | eBay

thanks

 

[marcah]

55 gal tank you would want in the realm of 1500gph turnover rate in it.. that would allow for corals down the road if you wish...
I would reccomend 2 koralia 750's put in ..

 

[AmberSunrise]

I also have a 55g and I have 2 koralia 325's and 1 aqueon 500 as well as the flow from my filter.

I have seahorses though so cant really do more than that but it does seems to really blow everything around really well.

 

[BCReefer]

Any advice on the UV? are they necessary? i do have a couple types of algae, might it help with those?

 

[AmberSunrise]

I have never used a UV maybe someone else on here has though.

What kind of algae is it? I had an issue with the long green hair algae for months here is what I did to get rid of it.

1. Reduced my lights from 9am-9pm to 11-am-9pm
2. Use ONLY RO/DI water not just RO
3. Bought a spot tail blenny who loves to eat it. I didnt know she would, but she does. I think other blennies also like it.
4. Every weekend a 20% water change
5. Physically remove as much as I could by pulling out corals and rocks and scrapping it off.

It was a pain in the ass and took me about 6 weeks but its gone and hasnt come back in months.

 

[marcah]

I have used a uv sterilizer in the past and as long as you keep your levels in check and keep up on waterchanges it really doesnt do alot as far as I am concerned.. didnt notice any change with anything after I stopped using it... It was a few years back and not really sure of the advancements made since then but I dont reccomend having to have one in the tank..