I was looking at a few nano tanks for my betta who is currently in a filtered 3 gallon bowl. Man these things cost an arm and a leg. The fluval spec 5 which is 17.5 long 6.3 deep and 10 high was $75. The eheim aquastly 6 was $62 and that is 12x12x10 (these figures are usable water space). These are really neat tanks, but I am not sure the cost is justifiable.. not when I can pick up a 10 gallon led kit for $60 or a 15 gallon standard kit for $50. So are these worth the extra money.. and why are they so expensive.