im puting chaeto in to make a refugium later on i want a mandarin. i know there hard to take care of and im just starting. i read the copepods can grow in a refugium. do i have to put copepods in there or somthing. i feed my fish frozen brine shrimp and ive heard of ppl asking there fish stores if they come acros one that eats frozen brine shrimp to hold the. what should i do???