Just a quick tip from someone who has made the mistake, feed those tiger barbs A LOT. I was using 3/8" long pellets (rough guess) and feeding one per fish. I had some losses. They get hungry.
I'd put your heater closer to one of the intakes. Not sure how the flow is actually working out in the tank with your setup. Your positioning may actually be optimal. But I've always thought that having the heater by the intake gets you a more even dispersion of heated water.
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