Glad to hear the pond and property are all in the family. If your grandpa built the pond, it sounds like it has already been creating multi-generational joy for quite some time. I like your plan to keep that tradition going!

Many types of minnows do not spawn on a sandy pond bottom, but on plants, debris in the water, etc. Their spawn may be completely unrelated to the spawning habitat available to your BG and bass.

I am glad to hear that you are getting some reproduction of your BG and bass. I expected that would be the case, I just don't know where they are spawning in ponds like yours. Do you ever see BG or bass in the shallow water guarding nests? If so, that might help you figure out what they like in your pond.

It does sound like you have the option of drawing down your water. You can clear a lot of pond bottom by only drawing down the water level a few feet. That should not harm your fish population. (Don't do it during the spawn or during the period of your warmest water and lowest dissolved oxygen.)

I can rent a mini-excavator in my area for only $200/day. I usually get it on the weekends so I can put a full 8 hours on the meter since most of my jobs involve multiple steps with me off of the equipment. That is the cost for the size I can tow behind a 1/2-ton pickup. If your family has a bigger haul truck, you can get a bigger excavator and move much more material and reach farther into the pond.

I have used the mini-excavators in standing water, but always in places that had a firm bottom. I think you could scrape the muck from the shore in a few places and then drive in a little deeper to extend your reach. (Only if you are comfortable operating the equipment and know how to use the bucket and boom to drag yourself out of slippery trouble.) You could then add some sand/gravel mix to enhance your spawning habitat.

I am a big believer in running small experiments before making large changes. You could even just clear the muck from some strips about 6' wide. That will change the rooted plant distribution in those areas for a few years. Lots of forage fish like "edge cover", as do the small bass. That could be an additional benefit to increasing your spawning beds. It also creates easy areas for small kids to fish.

If that is still over budget, maybe you could poor-boy some spawning locations. You can put out some landscape fabric in your muck and then make sand-filled depressions for spawning areas. Perhaps you could do a few in low-traffic areas where you can sneak an occasional peak and observe the activity on the beds. The BG may still spawn a few more times this year. You could find out what areas they like and their preferred water depth.

The muck in your pond persists due to the anoxic (no oxygen) conditions just below the surface of your pond bottom. Adding aeration may help the fish a little bit, but the main benefit is to help slow muck formation and perhaps even reverse it.

Your pond is so shallow, I would think (as a non-expert) that you could get by with some relatively inexpensive aeration. You could utilize a rotary vane compressor for your application. They are not that expensive and can be easily rebuilt, so you can achieve a long life at a reasonable price. Perhaps start a new thread in the aeration section and see what the experts say is the minimal system to improve your pond.

Finally, I agree with you as regards making decisions about pond management when there are so many variables. When I first joined Pond Boss, I thought, all I have to do is listen to all of these experts and then create the "perfect pond". However, as I kept reading, I finally figured out there is no such thing as a designed perfect pond. Every pond is ALWAYS a moving target. Good management can help you reach your specific goals more easily. It can also increase the percentage of time that your pond is a good fishery. However, the flip side is also true - since your pond conditions are always changing, it is difficult for you to really screw things up doing your management. Don't allow your pond outlet to get clogged, such that a big rain event blows out your dam. Carefully follow the instructions on applying herbicides or chemicals in your pond. Don't allow invasive species into your pond. If you follow those basic rules, then I don't think you can make a management decision that can't be remedied in the future after observing the outcome.