For some reason My females seem to be very "active" lately. They will swim to the surface, bolt around as if the don't know what to do, then swim to the bottom and wedge themselves in the furrows on my driftwood or hide under it. Two are completely acting normal, begging for food as usual. But the other four are acting unusually. Though they have no physical problems. Should i worry? Also my take is overstocked so i do 30% or so water changes every other day, making 120% weekly. There is a filter, and the shrimp cories and BN pleco are fine.