2 things first what do I use to clean up the exccess silicone and second should I do the whole reseal and let it dry before readding the overflow?

Using sharp razors will clean off all the old silicone. Reseal and let set and then do the overflow.

before i start cutting the bottom seals out im wondering if the panes of glass are attached to the top of the bottom pane or the sides i cant take the trim off so no way for me to tell and i dont want to cut into seal i know my last tank they were attached to the top of it so

oh and when u said let it set do you mean cure or just dry to the touch

I find the thicker the seal is the better they work, the trick is to start using the razor to lift the edge, get the tool in there tight and flat then run the whole seam off in one swipe...easy peasy.

how do i get all the small pieces of silicone out of the tank? about to start taping so im curious

A vacuum cleaner hose worked for me

WEELLLL im done but im afraid i may have to do it over again :( theres bubbles in the silicone that i just couldent smooth out. any advice?

So I was reading about the bubbles last night and some sites said do the reseal it compromises the integrity of the seal and some site said fill and it it don't leak after a few days its safe to use? What do I do fellow canreefers?

I guess it would depend on the size and location of the bubbles