I agree with Dave in getting them in as early as possible.

Last year they did a great job until I killed the majority of underwater weeds in my pond. Then they couldn't keep up with the algae growth from all the nutrients that were available. I had to use an algaecide just to keep it manageable for a couple fo months, then they caught back up.

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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).