Hello. A few weeks prior to vacation, it would be a good idea to feed the fish a little more and more often. They'll build up a little fat prior to their fast while you're gone. Continue with your larger water changes and then a day or two prior to leaving, change the water and make that change a little larger than normal. Fish can go many days without food, but three weeks is a little long. Zoo Med has a feeding block that's good. It won't foul the tank water and it will help keep your fish nourished while you're gone.
I totally agree with changing a lot of water and changing it often. I change half or more of the water in my tanks every week.
10 Tanks (Now 11)
I totally agree with changing a lot of water and changing it often. I change half or more of the water in my tanks every week.
10 Tanks (Now 11)