Aphids!

[Tindomul]

I have small green aphids that have attacked my beloved Masdie setup.
The setup if some of you recall, is a fish tank, open top, filled with 3 inches of water. I have one large taro plant growing from the center (Colocasia), and to the side I have a medium sized Anubias growing.
I chopped down all the Anubias except one leaf, and cut 3 of 4 leaves on the taro. the aphids were crawling all over them.
My Masdevallias and Pleurothallids are hung all around the rim of the tank, on the inside. In this way they have been getting lots of humidity (with the help of an ultrasonic mister). All of them had new leaves, and all the new leaves have aphid damage, so frustrating. The aphids leave little white circles that tell me where the plant was attacked.
Question, will this kill my plants?
I have also one plant sold to me as Sunipia bicolour, I think maybe it is really a Bulbophyllum bicolour. And today, I discovered it has a spike with two buds. the buds were being sucked on by tons of aphids. Do you think I will loose the flowers? Its so frustrating because this would have been my first bulbo bloom since I started growing these plants 5 years ago. And it would have been the first bloom for this plant since I started growing it 1 1/2 years ago.
I hate aphids.
I cleaned all the plants as much as I could, I no longer see any aphids, but they probably are around somewhere. I don't know what else to do. I am unwilling to use pesticides as that will damage my plants too. I just don't know.[/font]