hello i was reading the section about new tank set up / beginers section although ive kept tropical fish for ten years ive recently got a new tank my friend got my old tank , my tank has been up and running 11 days now and the ammonia reading is 1.0 , i can go to my friend and get either gravel or can i exchange 1 of my blue sponge or black sponge filter with him its the juwel type filter/sponges should i put the gravel in a stocking and hang it in the tank or is it best to swap 1 of my new sponges with my friends older sponge and just put his sponge into my filter, im doing a 10/15 % water change daily at the min