Went to check on fish last night after getting home and my pair of clowns were laying on the sand bed gasping for oxygen. One passed away around 3am last night but the other is still fighting as on 1pm today. So what happened was that i purchased a tail spot blenny last week, he wasn’t eating and passed away, since he hid a lot i did not find him until Friday afternoon (Don’t know how long he was dead in the tank). We had the ammonia spike so i did a couple water changes to bring it back down. I don’t know what to do about this last clownfish because he’s still fighting for his life, but still on the bottom of he tank, gasping and trying to swim. Please help me find a way to help him, or if its too late.