OK, so I'm wanting to upgrade my current Marineland Protein Skimmer but I'm limited on space inside my sump and height under my cabinet. There is only 28" from the top to bottom inside the cabinet. So, until you get the skimmer up in the water column, you don't have the height to get the lid off. Thinking of going with an external skimmer, and looking for any suggestions about what anyone has and what their experience is with them. Thanks in advance!