Finely chopped shrimp is good for cycling medium for QT. One small shrimp completely decomposes in 25 gals of water is about 3 ppm ammonia, applied several times during the cycle is good.
Shrimp blended to milk in a blender will give a sharper pulse, when a test of how fast ammonia is processed is the aim.
Bottled ammonia with no additives is also good.
when i suggested adding ammonia in the LFS today, the guy looked at my like i was nuts and said never add ammonia like that. this was before i saw your post. so i said okay then just give me some food, so thats why im raising the ammonia with the pellets now.