I don't think I can suspend this pump as it has the fountain on top, that would end up wonky!I have a string tied to my pump to keep it suspended about a foot off the bottom. The string also helps to pull the pump out if any maintenance is needed.
If you keep your pump sitting on the bottom, it will probably pick up debris that can settle down there. This debris can clog your pump and prematurely clog your filter.
To remove any accumulated debris, I use a pool net to gently skim the bottom in the Spring and the Fall.
So is it OK that it was sitting 3ft above the bottom and in the middle of the pond?
I thought it could go lower but the fountain wouldn't reach high enough out of the water. I'd have to buy a new pump/fountain that's tall enough or somehow hope I can find the parts to extent the current one?