Got home from work yesterday, casually my husband said that I might not need to feed the fish for some time, my Grandaughter had put some birthday cake into the tank (10 gal). By the time they had realised it had been in the tank for about half an hour. The tank was not too cloudy but I guessed that the sugar would be pretty high. So I did a major water change, about 60%. This morning the tank was very cloudy, not able to see some of the fish, however, the fish seemed to be ok. Thought about it all day at work and decided to take half of the water from another 10gal I have up and running, put the fish in that while I completely cleared their tank and then put back the fish with the water and all the bacteria I could salvage. This I have done. Then I have topped up both tanks as though doing a water change. Any comments please as I guessed this was the only thing to do.