Need a bit of help. i have had tropical fish for several all be it in a 70litre tank, 2 days ago i bought a 240 litre tank which was pre used and tobe honest in a bit of a state(algae everwhere), when i received the tank i jetted clean all the parts to remove the algae from the tank and all associated parts, approximately after 24 hours of resetting the tank up all clean and with chlorine reducers. the tank started to get cloudy after i had added 4 natural plants. could somene help me out as to what i was doing wrong, i did a test and it said that i had high amonia. i have since dropped approximately 50 % of the tank and replensished it with aquasafe and water now the fish are not swimming at the top of the water. PS i have lost 2 fish prior to changing water. any help is appreciated.