Page:The Book of the Aquarium and Water Cabinet.djvu/108

96 bubbles of sulphuretted hydrogen upon their bodies, and they should be removed before this spreads and devastates the tank.

Removal of Objects.—For the removal of portions of decayed weed, and other small noxious bodies, from the bottom, a glass tube of ¼ or ½ inch diameter, open at both ends, will be found very useful. Place a thumb or finger on the top of the tube, and thrust it down over the object to be removed, then remove the finger, and the matter will rise in it. Lift the tube up to the surface of