So i never had to take care of the fish that i have in my house but rather my dad took care of it. He went out of the states for 2 months. But today i found out his eyes are cloudy and he's really twitchy. I water tested the tank water and apparently the ammonia and nitrate levels are out of the scale. I know I have to change water more often now but anything I can do to remedy the fish's problem beside changing water? I feel like he won't make it if all I can do is change water 2 times a week. Sorry, my tank is about 120 gallons. I just did a 25% water change but should I change water again tomorrow? what do you guys think?