i have never tried to feed them zucchini, but i don't bother to blanche cucmber, i just wash it under tap water, chop it in half, exposing the most seeds (they tend to eat these first, as they are softest) and then weigh it down with an amazing invention james found on ebay called a screwcumber
but black angel let us in on her gelled food recipe last night, so i thought id pass it on to you!!
1 cup of lightly cooked veg.
You can use half a cup of peas
and half a cup of mixed veg, such as brocolli, spinach, green pepper, parsley,carrot.
If you use frozen veg then most are lightly boiled anyway.
1/2 a can of drained tuna or shrimps.
Liquify everything in a blender
in a pan dissolve 2 packets of unflavoured gelatin in half a cup of warm water, microwave it until its clear then add the veg mix.
Pour all that into a grease proof paper lined tin around 9x12" and then chill.
Once its set then you can cut into mouth sized pieces and take enough for a week and freeze the rest.
Once you get the hang of it you can add other ingredients such as cooked rice and fruit. Be creative.
i tried it out last night, and my fish loved it!!!
hope that helps!!