im currently keeping 5 small tiger barbs 2 small rainbow sharks a convict cichlid and a "dinosour" bichir in a 10 gallon tank(bigger tank broke, new tank in a few days). they have all been fine active eating. no problems. before i left for work last night i fed them and they ate and i turned the light out. i just got home from work to find all my fish acting weird. sluggish no schooling i didnt see any eat when fed and there all losing color. im thinking chlorine but idk when it could have been introduced. i changed a little bit of water yesterday but used natural spring water instead of tap. i cant even find the rainbow sharks so i hope its not to late. what should i do? is there anything else that it could be?