I need poweheads for a 68 gallon (36"x18"x24"). I've heard that Maxi-jets are the best so I am going to order three 1200's. Is this okay or is it overkill? I plan on keeping soft corals only. Also, would it be worth the $40 to buy a Maxi-jet Natural Wave Timer? Thanks.
In a 68 gallon I would use at least 4 maxijet 1200s. I had three in a 37 gallon and could have used another (yes I did have a sand bed) a buddy of mine has 4 in a 40 gallon. 4 in a 68 gallon would be on the conservative side.
up to you, the corals would be fine with the 1200s, I don't know your setup but the wattage difference will add a lot more heat to the setup.
I have 1180gph running through my 25g display (2 x PanWorld50px) it look a lot of adjusting for the sandbed to stay put. I have a mixed reef, softies are Kenya Tree, Toadstool, and Xenia)
I mostly have experience with smaller tanks so you may be better off using someone else... the 230gph x 3 will give you roughly 10x an hour turnover which is enough IMO for softies but more wouldn't do them any harm and may help in other ways.