This is my first small tank. It's a Mr Aqua 12 long. 36x8.5x9.5". Hang on back filter, 2 Koralias. LEDs.
My girlfriend overfed the tank by a ton when I was gone and I came home and my two clownfish are laying in the sand motionless and breathing very rapidly. I did a 50% waterchange. Added prime, and replaced all filter media (sponge, carbon, and purigen), even added more to my cleanup crew. It's been about a day now and no change in health. Should I do another water change or what? Help! Thanks