Are these the tanks that were on your shelving?  If so, do you think they would make a good sump/refugium?  I never ended up getting that new tank so I'll need to build a sump/ref for my 75 gallon.  I'm not sure how big or small to go with.  Are you home today?  If so, shoot me a text, I'd like to swing by and look/talk.  Thanks.