New to fish keeping. Ive got a 5 gallon tank I've been trying to cycling for over a month now with a amazon sword, moss ball, and java fern and drift wood pieces. Ammonia is at (3-4 ppm) but can't get any nitrites or nitrates. Tested my PH and its below 6.0, could that be the issue? And if so, is there a way to raise my PH without harming the black molly I have in the tank?