I could really use some advice.

I have a pond that is ~20k sq. feet. - just under 1/2 acre. it is oval in shape - about 150 x 120 feet. Just measured the depth in a few spots and it is 7'. The water level is high this year and this time of the year so in the middle of the summer I'd estimate as low as 6'.

I'm told when it was dug it was 10-12 feet deep and can only assume it has become shallower as organic matter has decomposed and created muck.

Electric power is about 375 feet from the pond.

I've had very different advice form those that sell aeration equipment. Most suggest a diffuser system with multiple diffusers; some say 2 some say 3. One of the systems I've been recommended are the Kasco Robust-Air RA2 and RA3 system. Another is an Airmax system for shallow ponds; best I can tell the latter just uses extra diffusers - 4 but pumps out less air as it does not have a rocking piston compressor.

I've had another pond equipment and fish hatchery owner tell me that an aerating fountain is the only thing I should consider and that is all he recommends.

The down side of a fountain to me is that I need to run electricity to the pond and it will use quite a bit more electricity. If it is the right thing to do though I will do it.

My goal is not for a visual effect but aeration to limit algae/weed growth and help clear the pond (along with dye and bacteria to eat away at the muck)

I'd appreciate any opinions on :

1. Should I be going with something like the Robust-Aire RA2 or RA3 diffuser system I should go with a fountain.

2. Is there any material difference between the Airmax 'shallow pond' system that would make it better (rather than just cheaper) for a shallow pond vs. a Robust-Aire system?

3. Is it reasonable for me to assume that with aeration and beneficial bacteria the pond depth will increase as the muck gets eaten away by the bacteria?

Thank you!