What would be the easiest way to plug/cover the bottom intake without emptying the tank? I was planning on cutting some of the black filter foam and using some tweezers to compress it and fit it in there.
Great question. I'm also going to a variation of this, myself. I haven't figured out a better solution myself, so.
I'm not exactly sure of the design, but you may be able to just take and flip it upside down.