I have the eshopps r200 sump I bought used and it's so confusing how it goes. So when I fill the tank up and it drains down to fill the sump only the compartment where it drains and the skimmer section fills up. If I have the water height slid thing all the way down it fills up the return section but if I adjust the height the return section and pump runs dry and the refugium section in front isnt getting any water in it. If anybody has this sump and can help that would be much appreciated