Chad, when you add the alum, make sure you buffer it with Hydrated lime to raise the pH, or the pH will drop too much and affect the fish. If the BG were feed trained, they will start eating the Optimal quickly. If they weren't, it'll take a while. Any stressors might put them off of the food for a few days.

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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).