50% water change and still 20ppm nitrates

[Milad]

Ok Im not sure whats going on here

Ive been doing a 10% water change everyday since Sunday and my nitrates are still 20ppm. This is getting ridiculous, ive almost went through a full bucket of salt. What could it be? I got algea growing on the glass everyday now.

I've stop feeding, ive stopped the zeovit extras i was putting in (zeozyme, cs, cv, sp, zeobak) and I cant get the nitrates down.

I have a pellet reactor coming but im not sure when its going to get in.