*sigh* Moving two fish in a few hours out of a 20 gal (being cycled for first time) into a cycled 200 gallon. Move imminent. 9" comet and 2" common. Just noticed something. A string of poop at least 9 inches long, brown, wasn't there half an hour ago. Didn't see it hanging on fish, just there suddenly. Had to come from the 9", too big for the 2". Googled a bit before posting. Parasites, diet change, stress, etc, impossible to definitively diagnose at moment. Could be resolution to constipation (hoping), they've only been there a week, and the 9" has had a 100% natural diet till now, been on API goldfish flakes since being here. Natural diet means whatever he could eat in his old metal stock tank outdoors (algae insects etc). Radical diet change. Any chance this is just a diet thing? Both being moved in hours no matter what it is, as tank being cycled for the first time now (beginner figuring it out learning curve long story why fish are here but being moved). Once they are moved it will be impossible to observe anything with any detail, the new (old) home is an unfiltered unoxygenated metal stock tank that will be quite murky, and they both shift to a natural diet (whatever they find to eat basically). This arrangement worked for five years for the 9", he's just going home.