Should the amount of fertiliser be reduced when there is algae trouble ?
A comprehensive answer to this question cannot be provided, as this would require a comprehensive analysis of the water, the fertilisation, lighting and the carbon dioxide supply, plus regular water care.
Although algae can be attributed to an excess of nutrients - particularly phosphate and nitrate in this case, - in many cases, they are also the result of a lack of so-called micronutrients, of which iron is the best known. Very often, this is the deeper cause of the algae problem.
When algae growth occurs, it is generally highly advisable to increase the amount and frequency of water changes, make sure there is a sufficient supply of fast-growing plants and fertilise these with JBL Ferropol or JBL Ferropol 24 in accordance with the instructions.