Adding a canister isn't necessary especially if you have a sump, I would advise against it solely for the fact that if you don't keep them clean (weekly cleanings) they do more harm than good. I did want to go back to lighting. If your going to be purchasing lights I would recommend you skip t5 lights and look at LED
. You can get an LED
fixture for the same or less than you would pay for a decent T5 but without no need to spend an additional $200 a year on lamp replacement. Also with LED
You will be able to keep more light demanding corals provided you buy a decent and reputable brand. I know mrX uses taotronics as do alot of others with good results. I use pharos and am very happy with them, a little more money but has some nice features the Taos don't have. Electronic control being one that will slowly brighten and dim your lights when they turn on and off so I don't need a timer.