Please can someone advise me...I have 2 platty's in a 60 litre, newly cycled tank (6weeks old) both fish eating but have seen them move erratically 'rubbing' themselves on decorations a couple of times in the last couple of days...also have seen top clamped fin on occation?! No spots, not as active as usual. Have added aeration as increased temp to 26. Water tested near perfect (master test kit) doing 40% water changes every second day......what is going on??????