I am new to tropical fish. Have a well planted, healthy tank which has cycled and amonia, nitrites are O, ph is 6.8 and temp is 78. We have 4 pearls, 2 sunset, 3 red honeys and 2 dwarfs. We have a 260L tank. One of the sunset seems to be courting one of the dwarfs although i think both may be male but unsure and while all of them swim around and feed ok, all spend quite a bit of time sitting on the bottom of the tank appearing to rest at different times of the day - breathing and fin movement seem fine. Is this normal - just need some reassurance as we have had white spot with our rummey nose tetras and while malachite green treatment sorted it out one of them died yesterday with one bulgy eye, its back end had pine cone type scales and it had fin rot (came on within 24 hours) - I know this may be signs of bacterial infection - we also lost a rosey tetra which had no apparent signs of disease but all of our other fish look ok, are feeding fine and swimming around with open fins. Apologies if you think i am being a bit paranoid.