Also forgot to ask....have a 55 gallon, fresh planted tank, all levels good, tank cycled, have 1/2 eco gravel base mixed together with regular gravel...can I add more eco gravel to the tank out of a new bag (obviously not cycled gravel in the new bag).....I need some gravel here and there with all the plants to bury the roots and such. Would this upset my cycle/biological filter and such??