I have three mollies, 5 pristella tetra, and 2 (tiny) siamese algea eaters in a ten gallon tank (which I know will become overstocked but I'm going to move the algea eaters soon). It is salted but the nitrite is a tad high (.5 ppm because the algea eaters are new) but everything else is good and I've noticed that the backs of the non-pregnant female molly and male molly are slightly bent. The poor male seems like he cannot move his. The preganat molly is fine but her excrement is red. I'm nor sure of the two sickly ones though. Are they sick and is there anything that I can do. Oh, yes, their backs were funny before the nitrite rose. Any advice would be appreicated. Thanks.