Hello! I have a 30 gallon and 20 gallon. My 30 has been going for 5 or more years same fish and everything is great! I got the 20 for my daughter, put a 30 gal filter on it…. Filled it with water, treated the water and I just can not get it to stay clear for more than 2 weeks at a time and when it was clear the PH was off the charts low. I boiled all the decorations and I’m afraid that perhaps that damaged them and now they’re making the water bad. Is that possible? What can possible be the issue? It’s a white greyish cloudy. Standard kid set up, fake plants, gravel bottom etc. i need help, I don’t want to put fish in until I’ve got it balanced and staying balanced!!