That humidity is ok the more the better with Nepenthes hamata. If the plant is not more than 5 inches tall or more than 6 inches wide it should do good in the tank. Sure it's ok to keep it in your basement just keep the right growing requirements and you can grow it anywhere.
Hope this helps
how are you going to give out exact sizes to the plants that need specific needs?
let me give you a basic rundown on how ive grown hamata successfully over the last couple of years...
starting out as a small plant, wistuba clone or not, they can be a bit tricky, needing decent humidity and lighting, and never letting the plant itself dry out because it will send it on a downhill spiral rather quickly at a small size....
as the plant increases in size (if grown properly, this will happen rather quickly, as hamata is quite a quick grower in highland standards IMO) the plant will become more hardy, and be able to grow just fine as a windowsill plant even.
Saying a small plant cannot grow in a tank, is completely untrue and as a small plant, i would almost recommend this over anything other than a nice highland greenhouse.
giving the plants light fertilizer treatments such as a diluted orchid fert, or max-sea will be beneficial, though if fed through its pitchers, the pitchers may die off a bit faster...
ive always preferred the coffee treatment, though i would allow the plant to establish itself before this is done...
My plants have always done best with daytime temps in the mid 70s to low 80s, and nights in the mid to upper 50s and humidity levels between 60-100%
they do like to have quite a bit of light as well.
When you receive you Wistuba hamata, i would be careful once you pot it up, to cover it in a plastic bag, and over the period of a few weeks or a month or so, add slits into the bag until the RH inside the back, is the same as to what it will be outside of the bag where the plant will be grown.
once the plants reach a size where you can feed them easier through the pitchers, ive noticed that ontop of a light coffee treatment every couple of months or so, they like to have betta fish pellets added into the traps, 1 or 2 is fine at a small size, and you can feed every trap.
If there are ample amounts of spring tails or fungus gnats or any of the sort in the growspace, do not worry about feeding them, they will do it all on their own, but will of course always appreciate a light fertilizer.
Enjoy your new plant, and one of the most bizarre species of Nepenthes