I know that they're mostly herbivores, but how often and how much should you feed them? I got a school of 5 that are 2-3" long a week ago. They didn't eat much at first but they're getting settled in and are starting to develop an appetite. I've been feeding a small amount of spirulina flakes twice a day, and some NLS Spectrum or a piece of an Omega One algae wafer once every few days. I'll also start feeding them fresh veggies on occasion. Anything else I should be feeding them or doing differently?