Maracyn One treats gram positive bacteria and Maracyn Two treats gram negative bacteria. So for cottonwool, which is a gram negative bacteria, you want Maracyn Two.
Haha, your little constipated guy sounds cute eating his pea.
Yeesh, I know how you feel. I have three pet stores all within five minutes of me and I'm at each of them at least once a week. I forgot gravel or I need a few more plants or I need cat food . . . the employees at the two stores I frequent the most start to roll their eyes when they see me. One of them even said, "Wow, I haven't seen you since last week."