Stand construction

That thing is plenty strong! Time to get it covered and get a tank on it.   

You have it built plenty strong - Nice work! With it being so tall, the only thing I would be worried about is lateral strength but once you put the plywood on, it will have plenty of lateral strength in both directions.

You'll be able to park a car on that thing once the plywood is on. Build on.

i would add a few side supports. connecting more between the 2 longest sides if that makes sense. i know its overkill but meh better safe then sorry

Looking at it again, I agree with Anthraxx - it could use some front to back support on top. Are you going to put plywood on top? If so, I think that would do the trick.

This is only $9, and it is what I have on top of all of my wood stands

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i went to a local lumber shop here in tacoma, cant remember the name but its on 6th ave. they had multiple types of plywood, i ended up getting something with more of a wood venyer type look. its still plywood but has a grain pattern to it. looks great stained up and doesnt weight nearly as much as doing a board front (did that )

That stand is beefy. It will totally hold the weight. Once the tank is on top and full of water it won't go anywhere. I built my stand. 7 foot X 16 inches. With the skin it's more like 19 inches front to back. It's completely solid with the water weight. But if I was going to have it as a divider sticking out I may consider a way to attach it to the wall. Perhaps find a wall stud and attach with lag screw. If there is ever an accident like a child pushing against it, someone falls against it, or falls and grabs the tank for support it may fall over. Not likey, but you never know. If something this size falls on anyone it could do some damage...

I would consider putting a floor in the stand using ply wood (not particle board) before putting a skin on. Once the skin is installed this frame will be completely solid. The skin adds support against any sideways movement. If you want this stand to look super nice I would consider using a ply wood (not particle board) that's finished on one side for a skin. Anything  that's at lest 1/4th thick will work and add to structural support.

Puting a top on isn't going to anything but make the stand heavier. The tank bottom never touches. Only the rim of the tank does. If you are looking for a nice finish consider using a  finished 1x4 for a cap. I went as far as using a router to round the edges. Please don't use particle board. If any water is absorbed by particle board it will expand and fall apart.

The stand looks great and  rigged. Very nice build!