Question:
Goal: How to Treat Cyanobacteria or Blue-Green Algae in an Aquarium

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Often wrongly called Blue-green or Slime Algae, Cyanobacteria is a common source of annoyance in the aquarium hobby and is in fact, not an algae at all, but a bacteria. Cyano can be killed quickly by dosing the tank with Erythromycin. Erythromycin is a common antibiotic easily found at most Pet stores or sold online.

Question:
Goal: keys

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
are designed to lock a door

Question:
Goal: Remove shingles from a roof.

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Use a shovel with a flat edge to pry up old shingles by slidding the tip of the shovel under the loose (bottom) side of the shingle and pushing until the shovel stops, pry upwards to remove the nails and the shingle at the same time.