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Doxycycline, Hyclate Cap?

I have blue-green algae in my 30L tank.
It's not very serious condition now, but algae is expending it's territory on a
I went to a pharmacy to buy erythromycin but they don't cell it in useable form but
another ???mycin,Doxycycline, Hyclate Cap.
Is it Gram(+), or Gram(-). Can I use this?
Anyone know about this?