Hello, Im new here and could use a little help. I have a 55g tank with 1 5in pleco, 1 swordtail (male), and 3 lyretail mollies ( 2 female and 1 male) My pH is 7.4 which I read swordtails and mollies like ph between 7.2 and 7.5 my nitrates and nitrates are at safe levels and my ammonia level is at .25. Ok so with that said my 2 larger mollies ( both females at 2 in) yesterday began swimming still and occasionally shaking. They dont do it all the time as they do stop to chase the male mollie and swordtail around. They are also eating. Im confused. Nothing in my book about this and i find conflicting opinions online from there having babies to their dying. I dont have much experiance with aquarium fish and such but I do have experiance in pond fish, koi's, goldfish, catfish..and ive never seen this kind of shaking. Please help. O...Ive had them for a week now and when I noticed this I did a 20% wc and vacumed half the gravel.