hi i have a 10 gallon tank it had 5 neon tetras 4 zebra danios (about an inch long) and 2 gloFish also about an inch long, yesturday after a water change the tetras slowly died of one by one and no im down to the danios and glofish, the lady at petco told me several difreent things that were possible causes of there death...but my overall question is what fish should i add to the tank and how many? i was thinking maybe three tiger barbs or just 3 mickey mouse platies and maybe some sort of algea eater, but please tell me whay you think will work best i just want a happy aquarium!