Howdy! I had a 75 for about 1 1/2 years. We started out with PCs but the ballasts were faulty and we wound up trading them in and going with a PFO manufactured hood w/2X175MH + 2 NO 40W actinics. Later we upgraded the 175s to 250s - lots more light since we wanted to keep clams. The hood had a fan but it was noisy so we stuck a 6" clip on fan behind the tank blowing across the back of the water. The hood had eyehooks and we could have suspended the hood from the ceiling but the light was blinding when you would sit on the sofa or a chair. That is the only problem I see with suspended hoods or pendants.
If you go with 250W halides and want to use Iwasakis make sure you get VHO actinics. You will need them to overcome the yellow tint of the 65Ks. The NO actinics just couldn't quite do it. If you go with 10K or higher bulbs, NO actinics would be fine. Be smart and get an Icecap ballast for your actinics then you can run any bulbs you like.
Laurie
If you go with 250W halides and want to use Iwasakis make sure you get VHO actinics. You will need them to overcome the yellow tint of the 65Ks. The NO actinics just couldn't quite do it. If you go with 10K or higher bulbs, NO actinics would be fine. Be smart and get an Icecap ballast for your actinics then you can run any bulbs you like.
Laurie