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I am new to fish and all so I accidentally combined two koi fish with 5 platy's. Then the koi, s attacked the platy's and killed two of them. I need an instant partition any suggestions ?It's a 24 12 12 inches tank
You could use white egg crate material. It is commonly used in lighting fixtures. Easy to cut to shape and is rigid.
Koi are not a good choice for that tank size.