SHould I use nystatin or copper sulfate? or something else? And WHERE can I get some? Her crop feels thick and spongy and will not empty after two days with just water and some soft food and oil...... Is there a definitive test for a fungal infection? Hen, 1.5 yrs old, went through recent molt, poor crop motility for a couple weeks but was eating and drinking, was lethargic (I thought from molt but she was sick!!) and has lost weight. any advice?