This is not really betta related but we have a 10 gallon community tank with 2 guppies, 2 tetras, a glo fish, a molly, and an algae eater. We do regular water changes and vacuuming every week. We have had everyone in this tank live perfectly fine for months. A while a go one of the guppies we saw was pine coning so we took her out and she died soon after. We watched the other fish for a while and no one else seemed to be pine coning or anything. A couple of weeks a go we noticed the other guppy wasn't really active and would stay on the bottom of the tank and wouldn't really move even when one of the tetras would nudge him to get him up. Within the next day or two we noticed it was dead. Now our molly really wasn't acting any different still eating and pooping like crazy, but yesterday he was pooping a long stringy clear poop. I looked up somewhere that that could be due to internal parasites. Today we found he was dead too. Now we're just wondering what we should do, we were thinking about taking all the other fish out in case there's something in the water and taking all the water out. My question is how do we empty a 10 gallon tank completely?