How much Daphnia to feed Tetras?

[kurly]

You would think that I should know this by now. I sometimes feed my tetras a small cube of Daphnia. For some reason today I noticed how fast they eat it. Absolutely LOVE that stuff. Everyone is getting some but I was just wondering if I should be feeding them more since I have 30 tetras in my tank. Is one cube enough or should I feed them two?

Thanks

[Aude]

How quickly do they polish off the one cube? I usually feed whatever my fish can eat within no more than five minutes.

[kurly]

I haven't timed it but I would say in a couple of minutes. It's also a little difficult to tell because the daphnia that isn't devoured immediately floats around the tank and every now and then I see the fish sucking one in it's mouth if one floats by them. I'll sit and watch them more closely the next time I feed them daphnia so I can see how long it takes them to eat the single cube.

Something tells me that I will be needing two cubes instead of one. Just don't want to overfeed them though.