Keeping my fry tank clean?

[cooleo589]

I will be leaving for a week tomorrow for vacation and I'm not sure what to do about my nursery tank. I have about 14 fry in a 3 gallon tank. All that the tank has is a heater, bubbler, and a live wisteria. I have someone coming to feed them twice every day but I'm a little worried about the build up of food and waste. Any ideas?

 

[Delapool]

Probably too late but should be ok. When I went away, I just put in a fish weekend feeder block and at the end of the week they were all ok.