Calling all Engineers: Tank Stand Height

I have a 300g deep dimension tank and a custom stand. I did not have the stand built but another reefer did and he's pretty knowledgeable. The stand is not much wider or longer than the tank. maybe an inch or so each dimension.



Tank is 72x36x27

Stand is 74x36x42 (approximately)



Assumptions: Tank is full of water with 100%, no rock etc. = 2500lbs in the tank.

Stand: 250lbs

Tank: 550lbs



I will have a 100g sump and 40g freshwater reservoir in the bottom.



The stand is 42" tall. and is more or less a peninsula. One side is against 18" of wall, so force that direction is not an issue as the wall will stop it from moving. My question is force applied the other direction.



My question to you engineers: Will this be safe/stable?



I think the extra weight of the sump/reservoir will lower the center of gravity quite a bit. My physics is pretty weak (physics 101 15 years ago).



If anyone knows a rough calculation of how much force it would take to start the tipping process if applied near the top of the tank, I would be grateful! (I know the sloshing water will make it a differential equation as the tank starts to tip). I'm happy just assuming there is no water movement and the weight is fixed.