I changed the plumbing completely different from what the original owner had, I changed from maxijets (even with the mods) to Koralias because I like the wide dispearsed flow better. I've added additional lighting because I don't want to run my MH for 12 hours a day, I upgraded the sump lighting, added a lot more live rock that what was in the original system, I've changed out the heaters, I'm in the process of designing and rebuilding the stand and making a canopy. And thats not considering my want to do list either.