Made the plunge, I have a few questions

[bbqman]

So I'm making the plunge finally. I bought this 75 gallon drilled aquarium, stand and light for $100. I have a couple of questions for you guys.

*it has an Odyssea T5 Quad Timer Aquarium Light.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Not what I want long term but maybe it can get me started with some decent bulbs. Can anyone suggest some T5's that would work? It will be higher light plants mostly. catt's etc. or should I just ditch it and wait untill I can get the LED's I want.

*whats the best way to cut eggcrate? I usually use wire cutters and snap off the "tabs". Is there a better way?

*I will be using LECA for substrate. How deep should I go. I presume "as much as I like" but not sure if there's a min - max for any reason.

* I see people using pond and stone Great Stuff and some using the original. Is the any reason to use one over the other? just seems to be color from what I can tell. I also see some people seal it and some people just smash coconut fiber and stuff into and cover it the let it dry. Do you need to seal it?

Thanks in advance. I'll post pics once I have something worthy of showing
.