ah i couldnt find them for some reason but i was doing more searching today and found some really nice Plankton Reactors which seem to be a really cool idea not sure why they are not more common and once again the majority of the ones i could find for sale were in the UK. i had never even heard of them before and iv been in the hobby for almost 2 years now.
Supposedly they can keep a continuous culture going which is dosed into your tank all day everyday with little maintenance.

Has anybody ever used one or heard if these reactors can actually keep a culture going?