Would recommend a total kill off (maybe with lime) and then starting over without grass carp, goldfish, or crappie. Since you are just starting out, little has been wasted. Then start with FHM for a year or two. That would give you plenty of time to get some plants going and decide on how to keep the pond from getting overpopulated with a lot of small fish as you stock the predator species. Been there, done that. My third pond is about 1/2 acre and has only FHM and lake chubsuckers so far (2 years), since the clay bowl is slow in developing vegetation. I stocked my second pond (1 acre) very slowly starting with sequential stocking of multiple forage species, and the later-stocked SMB have spawned and are growing at a phenomenal rate. A common mistake is to release everything you catch. Learned most of this here on pondboss over the years.
A friend with one he caught out of our first pond this past Fall.
