It does't get much cheaper than this...

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The bases weigh about 25 pounds each which is more than enough. They are about 10 inches square and 4 inches thick. The only things I would change is to use iron pipe instead of PVC and I would add a long eye bolt to each to tie the floating plastic ducks that I use to mark their locations. I have broken a PCV nipple when pulling the diffuser up, they get sucked to the bottom after a year. I had the rope tied to the upright plumbing...I might have $20 a piece in them.

I really like the professional look of your base! I just thought this might save you a few bucks. I got the idea from HighFlyer here on PB.

Fish on!,
Noel