Since your sump is acrylic I would just drill it. It easy to do on acrylic. Even if it was glass I would still drill it. I was just checking my HH pump now and I cant even keep it in my hand for to long before its to hot to hold. I have quite a few small pumps in my sump now that feed the fuge, frag tank, stock tank, and UV. Those will all be gone and an external pump with a manifold in their place. And with the CL on the new tank Ill be dumping all the powerheads in the old tank. Dont need all that extra heat in the tank here in AZ. And my electric bill will appreciate it too.