I have a filter that has 2 hoses. water in water out basically. My tank is a 100 gallons. 93 to be exact. I have an oscar, arowana, pleco, bala shark and a blood parrot. They live great together. Last night I'm assuming the wind pushed the hose with the water pouring out enough for it to drain out half in the tank and half out because when I woke up and went outside there was probably only 20 gallons left in the tank. Surprisingly no casualties. I filled the tank up, used the conditioner but now i'm worried that the fish will have new tank syndrome or whatever it's called. I've had the tank for almost a month now. When i put the new water in I tried to mix the gravel and bring up some of that bacteria because it's all I had and scooped out fish poop at the same time. I used stress-x but there was only enough for 10 gallons worth. They're acting normal and eating normal too. My local fish store was the one that gave me stress-x but he gave me a sample pack that did 10 gallons cuz he sold out. Should I run over to petsmart and pick some up? Is it worth buying it if my fish are acting the same? It's been 5 hours now.