Painted the floor and put a utility sink in the fish room here.
I would highly recommend doing both of those before the tank is even in.
Painting the floor was pretty simple, but the area where my overflow was splashing the tiniest amount seems to have left a salt spot that I just can't get out of the concrete and will need a second coat for sure.
The paint makes a HUGE difference. I would highly suggest painting the floor being the first thing you do to a fish room if you aren't going to tile it.
Did make my skimmer pull about 3" of water over night, which seems odd, but everything looks great.
edit, just realized this photo is real blurry, lol. I have a few touch ups to make, but one coat seems to be ok.
