Calling all saltwater aquarium expert for filter and changing water question. I need your idea please.?

Fluval is better than Eheim in my opinion. My suggestion since you haven't started yet is to go with a fish and live rock set up. I say this because its a easy to setup a reef this way. You wont need so many power filters. One will be all you need, reguardless of the size of the tank. What you will need is a ton of tank cleaners (ie turbo snail, hermit so forth and so on). Keep in mind that your live rock and sand will act as a filter. You will also need a protien skimmer that will be able to handle a tank that size. I'm using a motorized 150 on my 100 gal, it does a great job, but will cost about 150.00. Also your will need power heads to circulate the water and to also provider current for your corals. Another question, have you thought about the lighting you'll need to provided. That much tank (espesically with coral) the lighting alone is going to set you back about 400.00. Water changes should be done atleast once a month. I change mine one a month and I only take out 10%. I haven't had any probs. I never used any plants because some fish will eat them, and they can also release toxins when stressed. Email me with what you have (equipment wise)...and I will help you out. I'd hate to see you spend tons of money and things don't go as planned. fbh11201@yahoo.com