Those are some really good tips. They love Ulva and if you have a refugium all the better. Just to throw my hat in, you can get one of those cheep breeder hang on nets, (like $8 tops you can find them on Ebay if the LFS doesn't have one). and use that. Just keep moving those out of the breeder into the tank and you will be stocked up very fast. The pods also like to hide in macros, caulerpa, chaeto (as mentioned), codium and sargassum seem to be popular. If you live near a beach pm me and I will teach you how to catch a million or so in an hour. Never worry about buying them again. If you don't try not to buy copepods kept in green water, it tends to cause nuisance algae blooms.