Oh, sorry i think i misread your question earlier. I don't think the plants i bought came in pots, maybe something around the roots but i removed that, snipped the roots and put them in the substrate.Ok...so which did you buy? If in pots, how do you have them in your tank now?
It may have something to do with using plant substrate and dosing flourish twice per week. Is your sister's tank similar in this regard? Excess nutrients can feed bacteria and algae; and could be contributing to the bloom. I'm not sure you need twice weekly flourish (assuming this is flourish the fertilizer and not the carbon supplement) with a plant substrate.
My sister's tank is definitely not having the same problems as i am. She had the issue with slime a few weeks back but never cloudy water outside of the first few days the tank was up. Right now it's crystal clear for her.
I dose the fertilizer and the carbon supplement. With excel i dose that everyday, is that too much? I was doing the same with my 40 gallon and right now that is going through a surge of hair algae that i had to go through and rip out a hand full of. I can cut down on the flourish if that's what's causing it, and should i only dose excel every other day instead?