Who Gives A Fish Forums

I've got a 29-gallon tank with a few inhabitants. I have 1 male yellow lab, he's about 6-7 cm, I've kept him separate till he outgrows the female. The female yellow lab is 10-11 cm. Then there's a male golden severum, smaller than the female, also 6-7 cm. And lastly, I have a flowerhorn, he's around ...

I'm curious, can fish really make it a month with just an auto feeder and no water changes?