i have 3 melon swords in my tank and i am beginning to have problems. the leaves are beginning to have brown spots, and some of the leave look like they are curling or withering up. according to a nutrient deficiency chart ive narrowed it down to potassium, and maybe calcium deficiencies? im not really that sure. i am dosing with flourish exel once a week, and flourish once a week. as soon as i saw the leaves start getting spots i dosed with a little more flourish. what can i do? how long does it take for the plants to recover after dosing with flourish? also i just noticed my anubias are getting little pin holes in the leaves. ahhh, help, whats going wrong.