The brineshrimp hatchers work a treat.
I got them in before Aquanut did.
the only problem is that it is quite a big thing, around 20 cm tall, hence you need a pretty skinny tall tank to make the best use of it.
works really well if you are feeding a lot of fry, especially gouramis.
I found them easy to clean using a bottle brush
suckers do fall off after a long period of time, but what others don't?