Having some trouble keeping copepods in my tank. Tank is a little over 5 months old 48gal. Parameters are pretty stable where I want them to be. Fighting off a bit of a cryophytes bloom. Nitrates were low for a bit but since started dosing Neonitro. Have seeded with 4 jars of Ecopods on three different occasions. All times at night. Some in the sump. Some in the tank. Tried using a turkey baster to seed them directly into the rocks and sand. Have only ever seen pods in the sump for about maybe 2 weeks after seeding. Nothing ever in the display. Now I can't see any. Spent over $300 on pods. Anyone have any ideas on how to keep these guys alive? Or possibly a species that's a bit more hardy?