It's the same artist of Yukkurarium series, but I haven't been able to find the artist's name in Japanese sites, the only reference I have of it is at the artist's thread at Freeyy.org, which says 水槽一家 (suisouikka/suisouikke), which can be translated to "A fish tank house" or "A fish tank family". So the name for the artist can be "Aquarium_guy".