Materials, Equipment, and Preparation: 10 gallon fish tank vglass lid for fish tank sand or gravel 30 to 40 wooden matches limewater (calcium hydroxide) two small glass beakers or jars water long, fireplace matches Procedure: Cover the bottom of the fish tank with 8 cm of sand and/or gravel.
(fireplace; matches; T:30 to 40 wooden matches limewater (calcium hydroxide) two small glass beakers or jars water long)
fireplace
matches
T:30 to 40 wooden matches limewater (calcium hydroxide) two small glass beakers or jars water long