Oh really? maybe you researched a different kind or i might be wrong. The one i ordered is miner-all indoors.When I researched Minerall it said it’s phosphorus free. As for frequency...hard to say. I don’t supp at all in the summer and only once every two weeks in the winter. But our outdoor environments are different. If husbandry is correct...diet and lighting...but mostly indoor lighting...I would always err on the side of caution. I’d ask experienced fellow keepers in Sweden or like “season” like keepers. For me not living there it were purely be a guess that could be totally incorrect