HI Adam. I have a RES turtle that I feed turtle stixs. I have two decorative catfish, two goldfish-one about 4 to 5 inches and the other is 3 inches, plus a pleco that is about 10 inches all in a 75 gallon aquarium. When I feed my turtle, the gold fish will eat the stix I feed him. I feed all of the fish flakes. The water has started staying cloudy and green so I know I’m overfeeding. My question is how much should I be feeding the fish? I feed them twice a day too. It’s hard to tell if they have eaten all of the flakes because the flakes sink to the bottom into the gravel. Thanks so much for your help!
Feeding Vegetables to Aquarium Fish - Aquarium Tidings
If you're only going to be away for a week, your fish should be fine without food as mentioned above. If you have a saltwater aquarium you may need to adjust the skimmer collection cup so that it doesn't collect as much since you won't be there to empty it. If you're going to be away for a longer period of time, than say two weeks, you will be really risking it not having someone come over. This is from a water evaporation and feeding standpoint. Although you're fish should be ok from a food standpoint, your tank water may not be in the best shape after two weeks without your care.
Come and Feed the Fish at the Aquarium | Austin Aquarium
Recognizing the negative impact of overfeeding fish is a bit of a murky affair… literally! Often it isn’t until our aquarium is afflicted with cloudy water, green water, or excessive algae growth that we realize we have a problem. Understanding what caused these problems requires us to connect the dots. Too much food is the primary cause for accumulating organic waste in the fish tank. Beneficial bacteria break this waste down into ammonia, nitrite, and eventually nitrate through a process called the nitrogen cycle.
Feeding Fish - Aquarium Adventure Columbus