MH bulbs for 24in tank? advice?

[Myka]

Giesemann. You would find the Phoenix bluer, but also brighter looking. The Giesemann 13K is a nice bulb, but I prefer the Phoenix.

[jostafew]

+1 on the warmer color temp. If you're doing light demanding livestock you'll want maximum PAR thats available from the warmer color temp such as 10k (especially considering the lower wattage MH bulbs). You can offset the lower PAR output of the cooler bulbs by getting the fixture closer to the water surface, just be aware of the increasing heat input as you drop below 12" between the water surface and the MH bulb. The 14k Phoenix is a good compromise between glowiness and PAR output.