Abstract: A pump hanger for an aquarium having a pump firmly fixed with a vertical plate, the vertical plate having T-shaped keys on its upper end surface to fit up through a through hole in each of two recesses in a horizontal plate portion of an L-shaped plate frame, the keys possible to engage any of divided grooves in each recesses to adjust and secure the position of the vertical plate, the distance between the vertical plate and the vertical portion of the L-shaped plate frame being adjusted by the position of the vertical plate adjusted to suit to the thickness of a vertical glass of an aquarium to hang this pump hanger thereon.

Abstract: A biochemical drip board for aquariums formed of a flat board having a plurality of short posts extending down from the bottom, and at least a hanger at one end, each said short post having a very small center through hole to function as a capillary to slow down speed of water flowing therethrough and to cultivate active nitrate bacteria therein for disintegrating organic matters in water into nitrogen and ammonia and consequently preventing water from worsening.

Abstract: A hanger for a tubular lamp in an aquarium comprising a hanger body having an intermediate square flat vertical portion bored with a center hole and two elastic hooks extending sidewise from the square portion and an opening being formed between an outer end of the two hooks, a cloth brush shaped as the hanger body and fitted around an inner surface of the hanger body, and a sucker having a sidewise post with an annular groove to releasably engage the center hole of the hanger body to combine with the hanger body, the sucker attached on an inner wall of an aquarium, a pair of this hanger used to clamp both ends of a tubular lamp and attached on an inner wall of an aquarium with the suckers.