So I am currently cycling my Fluval 13.5 and noticed that the display portion stays the same level but the sump chambers cant hold the same amount of water. My only concern with this is that I have a Eheim Jager 100w that isn't submerged under the minimum water line on the heater. Is there anyway to counter this? I have read that filling it up more will counter it but its already filled pretty much. Thanks in advanced!