Hi there, I will be setting up a 150 gallon mixed reef tank and I will be putting 4 Maxspect Plates between the baffles. This will be the main biological media in my tank. In the refugium area (last chamber before the return pump) I want copepods to grow. I want it to be a semi-cryptic refugium, so I want to know what will be the best place for copepods to stay? Will they prefer to stay in rubble rock or sand? Of sand is better then I will put sand in a plastic container so that it is easier to take out and if it is rubble rock then I will just leave it there in refugium area. Please let me know, thank you!