I like the banana idea ....... one for me, one for the fish ...... one for me, one for the fish ..... etc., etc., ...... (repeat as needed) ......

Breed, As far as using eggshells, keep in mind that they will make your system more alkaline, just like seashells or coral, so you've got to watch your PH if that's going to present a problem! My PH is already high, so I couldn't use something like that.