OK so i just had a huge spike in my ammonia/nitrate/nitrite levels is this the sign I was looking for? It was amazing how rapidly it spiked even though I do constant water changes!!! Ok another question if fish are sick from elevated levels how long should they take to recover? also how long after should i wait to add new fish? And my last question does anyone here have a recommendation for a gravel vac the one i have now blows i think i can probably clean my gravel better with a McDonald's straw than this thing