I don't think odyssea makes a three bulb fixture that size. More importantly, does anyone knows if you can run two of the four bulbs in this fixture. Thing about using actinics is that although plants cant use it, I would bet that some optimistic algae form could capitalize on it. Life is like that. Given an unoccupied niche, life finds a way.
Forgot this was a thread about a 10g, so yeah, I don't think a 3 bulb is made for that size either. I've heard both ways about actinics for a fw tank though, so perhaps it's more about how well everything else is balanced than just the actinics themself