Will this make a loud noise?

[cichlidcichlid]

If i get a fixture made by eclipse that is 2x55watt and has four fans will this cause a noise problem?

Do i need a co2 system for this?

Is it too much light for a 29gallon tank?

What could i grow with it?

Is a 24in fixture big enough to fit on a 29gallon tank?

What is more expensive replacing the t5 lamps or replacing te power compact 55watt ?

[jflng]

It depends on what the fans' dBA ratings are. You will probably hear them some.

You will definitely need Co2 and ferts.

It is quite a bit.

You can grow pretty much anything (including a lot of algae).

Yes it should fit lengthwise. How wide is it?

Not sure, It probably depends on individual lamps.

[theotheragentm]

The default fans on light fixtures are generally quite loud. You can normally swap them out with quieter fans.

[cichlidcichlid]

I am not sure what the width is but it says it is 24inches long.

[jflng]

I don't mean to dishearten you about your lighting choice, but that much light will require extra maintenance.
Can you operate the lamps individually?
You might need to find out how wide it is.