So i have a 20gal long and currently have a 2x65w PC fixture for lighting. this has been more than enough given the fact that it is about 6.5w per gallon. however i would like to get a MH setup on there for sps and aesthetic purposes. Is there something that i can use with my current setup or do i need a whole new system. the problem is they dont come in the 30" long fixtures. only 24" and 36", 48", 72" etc. what is my solution? get a 36" fixture for so that my future tank will be able to use it? or get a 24"? obviously i will need to hang both of these from the ceiling... any input or stuff for sale let me know.