hello there could anyone tell me if i am doing the right things when changing the water,i change about 20% of the water once a week,clean all the alagae from the glass and ornamants and trim and pull out any dead leaves on the plant,now after putting the water back in i add some stress zyme and sometimes some easy balance is this the right thing to do or not,also i have read about adding some salt,what does this actualy do and should i start doin it,at the moment i only have 4 zebra danios,and 7 neon tetras,did have some clown loaches but they didnt last 2 mins,sorry for the long post any help much apprecited