We deal with a lot of problems on planted aquariums - after all that is what we specialise in so naturally we expect to deal with a lot of the same issues. One issue that crops up over and over again is the way people deal with problems. Now it was Einstein who defined insanity:
Insanity: doing the same thing over and over again and expecting different results
and it's so true...
Many hobbyists keep doing the same things and expect to get different results - which after reading the above makes you insane. Now of course this is an exageration, we don't really think you're mad but it's making people aware that they need to try something different if their planted aquarium is not going the way they expect. Lets look at an example of yellowing leaves. Customer notices some of the leaves on their crypts going yellow and thinks that's strange but ignores it hoping it might go away.
Now yellowing of leaves normally indicates a nutrient deficiency so the remedy - add more nutrients.
Next couple of days the situation is no better, in fact it's worse. More leaves are yellowing and no more fertilisers are being added. This fictional story happens all the time and I encourage you to do something different if you're not getting the results you expect. In this situation if you added more fertilisers you would notice a positive difference. Leaves would begin to look better.
So next time things aren't going your way in your planted tank, think about what Einstein said and then, do something different :), oh and add some ferts too