more importantly, what is your budget?
I decided to go with a 100 instead of a 75 and now i am almost regretting it. (not really though) If I had stuck to the 75,-for as much cash that I have drained into the 100- I would have LR halfway cured in my tank, not just a pile of stuff on the living room floor. (can;t seem to get plumbing right...)
well, house, you are already in a better place I am. I live in the third floor of an apt and didn't find out I could get away with a bigger tank till I already had my tank in place with fish
. I have dreams of a tank that is 10 ft long, so I'll be happy till then.
If your budget can support the larger tank AND you have a place to put it, then go for the larger. One of my friends got a tank and had to literally rearrange the downstairs to find a place for it (but it was huge)
.
Otherwise, there isn't that much difference & you'll be fine with either