At the moment because they are quiet small they are in a 1250x600x600 fully encasedglass enclosure, mesh top,150watt Halogen heat lamp and Nec10 blacklight fluro,with a hailea filter. because of the ambient room tempreture no water heat is required as yet.
This will change as they grow and their enclosure grows with them.
One day I will get a pair....LOL. Love mertens, just don't have anywhere big enough for them at the moment. Indicus is right there beside them on the list, awesome monitors too.