CALCIUM HYDROXIDE AGAINST HYDROID POLYPS

Hydroid polyps of the Myrionema genus sometimes develop so abundantly that they can constitute a problem, especially in hard coral aquariums. Some fishkeepers advise to eliminate the polyps by using calcium hydroxide powder mixed with water. First you stop the water circulation, and then you cover the polyps with the whitish solution. After a brief waiting period (about 30 minutes), the circulation can be restarted.

Myrionema

Myrionema hydroid polyps can be eliminated with Calcium hydroxide. Photo: D. Knop