I’m planning to switch to New Life Spectrum Thera A to feed several of my 5-6” upper jaw bichirs. Right now I’m feeding them Hikari Sinking Carnivore Pellets and the pellet size is just perfect for them. Since I’m planning to purchase online, and didn’t want to make the mistake of getting a pellet that is too small or too big for them, which NLS Thera A pellet size should I get ?