What I did on my stand was caulk all the way around the bottom of the stand, so no water can go under it, then used moldings to cover that. Caulk is easily removed If you ever need to, water under a stand isn't & will ruin the finish. Inside the sump & caulked the sump to the floor of the stand to prevent water from ever going under it, again a life saver.
P.S.
I always keep about 4 or 5 old towels around the tank just to soak up spills fast.