Looking good. Those different looking fish may be pure Green Sunfish (GSF) that washed in with the Gams. Add 25-50 Largemouth Bass to the pond, but I would not add any that were smaller than 4" or 5" or they may be eaten by the HBG. If they had 10" bass I'd add 25 of them. . Once the Bass pull off a spawn (Most likely 2026 for the 4"-6" ones, maybe this year if you add 10"-12" ones) start pulling out EVERY bass that you catch that is over 14" in length. You don't want large bass in there, you want a bunch of small bass to eat the overabundance of small HBG or GSF.

As for what minnows to add, you really don't have to add any if you are feeding the fish. The Gams will be plenty. If you feel that you have to add some, add more Fatheads. None of the other minnows will help you with your goal.

One thing to watch (but it might be hard) is any surface water flowing into the pond. You don't want bullheads, gar, carp or other fish washing into the pond. So, if you can stop more surface water from running into the pond, it will help your goal.

Check the laws there. If it's legal to stock Tilapia, stock 8-9 pounds of them this Spring. They will help control most or all of the algae for you.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).