This is a really nice domain name, I would'nt mind owning it myself. If anyone is looking for the end result of this domain please post some details here.
I am asking $1495 for aquariums.info. I would guess the .net could be somewhat higher than this, and If I had it I'd be asking somewhere around $3-5k retail. Although, to the right buyer, I wouldn't put it past this one going for 5 figures.