I don't think MOST croceas should be kept in the aquarium industry, just at all. I say MOST because I have stumbled across some pretty unique ones over the last 6-7 months that seem to have lighting needs closer to Maximas or something. The verdict is still out on them because I haven't been able to do much with them as of yet, but it might be interesting after a year or so. 150 watts isn't that much, even for a Maxima; I would think it might be ok if the Maxima stayed higher up and didn't jump off.