So i have a albino channel cat and a redtail tiger cat. So what i am wondering is that i have changed my tank and took the stone out the bottom. I put white pool fitler sand in the bottom now. The thing is that my catfish look bloated all the time now. So i was wondering if they could be eatting the sand? I have watched them but have never seen them eat the sand. I have not changed the way i feed them. So could it be that or could there be something else wrong with the fish?

