I have 11 females in a 46g & I feed NLS pellets with the occasional frozen food. I open the tank lid & stand there until everyone comes up to the surface, I take a pinch of the pellets and I scatter them around so everyone kind of spreads out, some of the pellets will sink, I watch to make sure everyone gets at least a couple. Some girls are bigger so they eat more but everyone gets some. The pellets that sink will be scavenged either by my snails or the girls will hunt them down. I have one girl that sometimes won't come to the surface so ill drop pellets in the area she's in & she'll usually see them as they sink. I don't worry too much if they miss one meal if I saw them eat the day before.