A controversial way to combat algae is to use aspirin. I hope that nobody carelessly uses medicines in the aquarium. It can only be a last resort after all other options have been exhausted.

The effect of aspirin on algae is by no means proven and any use is an experiment with risk.

How quickly aspirin destroys the algae depends on the type of algae. Some types disappear after a few days, other types only after weeks and against some types of algae aspirin does not seem to work at all. With some green algae, with beard algae and with brush algae, it only seems to stop further growth.

Harmful side effects on fish and other animals as well as on plants are not known (but please talk to your veterinarian beforehand). Since similar compounds found in aspirin are found in natural bodies of water, this may well be plausible, but caution is warranted.

Normal aspirin or corresponding imitation products such as e.g. B. ASA Ratiopharm. The dose is 50 to a maximum of 100 milligrams per 100 liters of water. Lower doses may also be sufficient. For better dosing, it is best to dissolve the tablets before placing them in the aquarium. In addition, the binder (corn starch, cellulose powder, lactose, etc.), which dissolves poorly, can be removed beforehand and then does not get into the aquarium. Since the aspirin decomposes after a few weeks, it may have to be replenished at some point. According to experience, it has to be replenished after 2 to 3 months.