Cycling my aquaponics system with 5 goldfish 4-7” long indoors in a 110 gal stock tank, 45 gal growbed and an 18 gal filter. It’s been 3 wks and my ph is consistently 6.4 to 6.6 after three 30% water changes tho the ammonia remains at 4.0. I have two air stones in with fish and one in filter. Water is de-clorniated for water changes. Temps are around 74 degrees. Nervous about the high ammonia a…