Honestly skip the Maxijets they tend to be very noisy especially when starting up plus the suction cups don't hold very well. Look at koralia pumps, a little more money but nicer looking, quiet, and they have a magnet suction cup so they stay put. Depending on what you want for coral will dictate the flow you want to aim for but if funds are tight you can add more later. Personally I would suggest starting with something in the 1000-1400 gph
range then if you add more coral you can add another powerhead. I run 2 1050 and a 1400 on a wave maker in my 55g but I have softies LPS
. A rule of thumb for flow is as follows- 10x tank volume for fish only, 20x tank volume for LPS
and softies, 30x tank volume for SPS
. More flow is never a bad thing as it circulates water through your rock which is the biological filtration (hence the term "live" rock) just avoid aiming the powerheads directly at coral.