My tiger barb is attacking my catfish and killing every fish I put in the tank!?

Not in that tank, no. Tiger barbs need at least 8 to a tank. You need more.

Pictus get very large and need nothing less than 40 gallons. They are also group fish and need at least 3 to a tank. White skirt tetras need at least 5 to a tank.

You need to upgrade to a 40 gallon for your pictus and to up the schools of your fish. Get at least 8 tiger barbs and they won't fight. You can buy normal white skirts, they don't have to be neon.

The fish don't care about color. Or: Rehome the pictus and the tiger barb and stick with the white skirts. Petco is starting (or has started, not sure) their dollar per gallon sale.

Why don't you grab a 40 gallon from them?

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