So I have the issue that I only have about 7" of clearance between the top of the sump and the bottom of the 125 gallon tank. My issue is how to get the skimmer in. I can fit one in there because I have about 26" of room once it's in. The tank is cycling and I should be able to drain the tank slide it a foot. Put the skimmer in then slide it back. My issue is I have seen tanks crack from I suppose twisting in the past. I'm open to many ideas to solve this issue and hopefully people can chime in. Maybe pros and cons to an external skimmer. The likelyhood of the skimmer failing because to get it out I'd have to drain the tank and move it again which can kill things. I'm in a pickle and this is a brand new setup so I'm open to all ideas including removing the 55 gallon sump and putting in a smaller one if it's better in the long run. Thank you to everyone. Oh and the removing the 55 gallon is the last resort because I'd have to drain the tank remove the rock and probably the sand lift the tank remove the sump then put it all back together. It is doable but I'm 2 weeks into the cycle and don't want to wait again haha. But if it's necessary then life goes on. But I'm sure there are alternative options.