if you can afford it go with the 250's it is night and day from a 175 to a 250.. doesent sound like much but it is a huge jump PAR wise, especialy if you go the HQI ballast route. I had 18" of water and a 175 to start with and then I upgraded to the 250's.. I can say I got a lot faster growth and a tone more color (even from the LPS and softies).
plus there are a lot more options for bulbs in the 250 size.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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