Brown diatom algae cure??

[Maintenance Man]

Hello all . I was at the pet store today and I was asking about a cure for brown diatom algae (which is turnning into a slime algae). they told me to use this stuff called Erythromycin has anyone else use this stuff before and if so what was your results . They say it is reef safe But before I use it I would like to hear from all the reef geeks out there The bottom ofour tank is turnning brown really fast and i am starting to get concern about it . Thank you for your imput folks