About to buy some powerheads, and I would like some advice for a 55g.

[Coralgurl]

I have an mp10 and 2 koralias on my 55 gl. I have not been successful with sps in this tank likely due to lighting more tank flow, but lps and softies do extremely well. The tank was started with 1 mp10 but this was not enough flow even when cranked up to full was getting no surface movement.

I can't say anything about the tunzes as I've never used them.

[mike31154]

I ran my 77 gal for almost a year with a single MP40 & added a second when finances allowed. Kept my eyes peeled for used 40s & now I have a third on the back pane of my 77 turned down to low flow. During the time I ran a single 40, I supplemented the flow with a canister filter & a couple of AquaClear powerheads that came with the tank when I purchased it used.

I haven't seen an MP10 in action, but my advice for a tank your size would be to go with a 40 initially instead of two 10s. The single 40 (along with a cheaper powerhead or two) will provide plenty of flow for a new tank & once it matures a little & you have the extra cash, the second MP40 will provide more flexibility & options down the road as far as livestock choices.

No clue about Tunze, never owned one or seen too many in action, but judging by info I've seen on various forums, they are a very good product.

[gregzz4]

I won't disagree with Mike's MP40 suggestion
Just make sure you can stomach the replacement parts costs