I've been having a problem now for a while that plant growth has stunted and new leaves from Aponogeton and now nana nubia have holes. At first I thought it was the clown loaches going after them but after careful checking i see holes in newly formed leaves. There isn't much in yellowing or black circle around these holes and growth has definitely stunted. I just can't figure out which nutrient the plants are lacking or (from googlling) from a specific cause for new leaves having holes (old leave is said to be potassium). I've tried adding potassium and magnesium but they haven't helped much. I've also increase the dosage of thrive+ i add to the tank (there are also root tabs under many of hte major plants). Could this be a carbon or nitrogen issue? (i do not inject carbon and my nitrate runs around 25 ppm). About the only plant doing really well is one of the dwarf lilies which wants to send a leaf to the top every couple of days.