Yes 2 250W will work. Actinic supplement is not necesary but most people prefer the color of the MH run with Actinic. Unless you go with 20K or 14K MH bulbs you will have a very yellow looking tank without Actinic of some type, wether it be VHO, PC, T-5 or NO. Actinic supplement will also give you the chance to do dawn dusk simulation with the lights.