There are some feeders on the market. Established companies such as Eheim, Sera, hobbies offer the following equipment. All have in my view a huge disadvantage. Whether the drum has really delivered the feed, can only be guessed. The amount that has been paid is also difficult to monitor. You always feeding the same mixture, ok the Eheim Twin 2. The Grässlin has this, very important for me criteria, all met. Because if the bowl is empty, I can assume that the food is not flown out the window, it ne must have fallen in my fish into the pool :-) I need him, especially when I have bred. The breed needs reliably every 2-3 hours lining, precisely metered, verifiable. > Power of Grässlin! And most importantly, who will always feed the whole day the same! The Brut (not only the breeding) develops umpteen times better if there dekapsulierte at 9 clock Artemia and Cyclops clock by 12, by 15 clock grated Bachflohkrebse etc. And as much and in the same sequence as I want it. > Power of Grässlin! And if the breeding mal ne single week have, feeding the Grässlin with 28 bowls also juggernaut loose, Eclectic! Now stir things up here a lot because of the mess up. The part once a month Thoroughly clean (bowl in the dishwasher). If really when filling which falls next time a dish, ok, bowl fast and unhook with NEM brush det stuff to the fish that would be the :-) Appendix: I use a 1/4 Teaspoon for filling the bowl, I can not think so virtually never what next! The Grässlin is in my view the device that combines the key advantages. Thus, the best device on the market.