Floreal + Iodine 100 ml fertilizer supplement for aquarium plants, Aqualine Buschke. Floreal is the essential supplement to Ferreal. It counters the symptoms caused by mineral deficiency of the plants, and provides them with iodine and fluoride. This gives a visible boost to plant growth. Floreal contains, in addition to iodine and fluoride, many other essential minerals such as potassium, magnesium, and iron and also many necessary organic substances. 100 ml for 50 gallons.