Scott
Welcome back to the "madness and the addiction" err Hobby
What type of tank did or are you wanting - fowlr (fish only w/live rock) or a reef? This will regulate you to what type of equipment that you need or want.
For fowlr - you won't need too much light, a skimmer will be nice cause of the bio-load. Or even the
canister filter will work.
Now for the reef part. There are so many combinations and different ways to acheive the same goal - great water params and diversified cleanup crew (lr & DSB or lack of one) to be able to house our little piece of the ocean. You may want have a sump for your skimmer, heaters - (but some guys are running sumpless), a refugium for growing out
macro algae and a haven to grow pods and such for the tank. Maybe even use as a holding tank for that "bad" fish. A calicum reactor if you are going toward sps's, kalk ractor for top off.
So as you can see this is just the begining. Maybe read and read up on what you want. Will need to know which way you want to go then we can answer better.
