In a BOW that size, not hiring a professional is like being sick with something serious and not going to a doctor, instead stopping the first person you meet on the street for advice.
Without an electroshock survey, you have no idea what fish are in the BOW. Stocking more fish on top of what is in there without knowing what is actually needed is flat out throwing money away.
That's like taking medicine without knowing if that nedicine will work on what's ailing you.
Give the HOA board of directors the information how to get to this place and have them look at it.
But on the other hand, if they are that set on their ways to throw money away, there's not much you can do about it.