has it gotten worse over that week? what prompted that?
okay, so if you saw a hint of somethign to start, use a leaf chart to deduce what it was and adjust what you feed. ratio / concentration / whatever...
start feeding again, because it's almost certainly a deficiency based on recent behaviour... unless it was just toxic as heck last week.
it's not light burn. plants wilt and form pale spots, then leaves turn white-ish... some mistake it for albinoism.. but if it isn't albino from seed it's not an albino, lol.