Wow! I wonder how much it would cost to get a cover cut for a 20 long (just got one for $20 at Petco)...probably not that much of a savings from buying a Versa top, but worth investigating perhaps.
I agree that sliding is safer and easier then lift hinge, I only use the hinge on my smaller tanks. but on tanks sizes 100 and above and especially tall tanks with wood canopy's where you cant see the lid opening, sliding prevent a slam shatter where the tank lid falls from the open position and shatters on the tank brace, whereas with no hinge sliding there is far less chance of accidental braking and falling in, provided you are using guides.I use hardware store-cut 3/16" glass tops on almost all my tanks. I use little adhesive hooks made for showers and kitchens for handles, much cheaper than buying the all-glass adhesive handles they sell. I also don't bother using a hinge, i just put a handle on the front piece, and lift and slide it back on top of the back piece when I need to get into the tank.
The glass on top of a tank (at least on mine) never really bear any load, so I've never had issues with them breaking (except when I dropped one on the floor, oops).
Not shower curtain hooks, those adhesive plastic hooks you put on the shower wall or next to the sink or something.
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They usually have a backing you peel off and the adhesive sticks to glass pretty well. For smaller tops I just use one in the middle, for larger ones I use two, one toward each end. Not the prettiest, but it works, and if you have a canopy over the tank you can't see it anyway.
The glass I thought was too weak and thin was the pre-cut panels sold at hardware stores that are 3/32 thick which is less then 1/8, way too thing and doubling up would make it cost prohibitive about $50 for 4 doubles up panels.I don't see why you couldn't just double the glass up if you think it is to thin, then just use some U channel plastic trim around the edges.
personally, I don't like to cover my entire tank with glass lids and attach to the front edge some stainless half round gutter guard material like this:
http://www.guttersupply.com/p-gutter-protection-k-style-hinged.gstml
They come with hinges and clamp right on to the glass...whala, theres your hinge. Allows for better air transfer and I like the look.
I tried 1/4" Poly covers on my 120 tank and when the edges are warping up like old plywood they are falling in the tank. Suffice it to say Ill never use Poly as covers on any tank again. I do hawer admit that a tank made of Poly is very light weight, durable, and strong.Several of my tops are clear polycarbonate also, Which I just cut on a table saw..