I would just like to add to RD that soaking pellets in epsom salt does help in passing the white feces from the fish. Unlike just having hex my tank went into turmoil with a slew of infestations. Including Ich, external worms, hex and HITH. I was putting epsom salt in the tank so that they can pass there feces as well as soaking pellets for digestion. I was also mixing the pellets with a little metro as well. Ich, external worms and hex have all ceased in my tank using only these 2 products. I am still fighting some HITH with my red sevrum but continuing epsom soaked pellets. Luckily she is still in high spirits by jumping out of the water to grab some krill I dangle from the surface of the water. The only downside of epsom salt and metro is that they wrecked my plant life, but you know what who cares lol. Thanks for all the advice and various methods from everyone.