I had just bought 3 Guppies, and 1 Siamese Algae Eater for my 30 gallon planted tank. The parameters are 7.4 PH, Ammonia .5, Nitrates and Nitrites 0. The Guppies are constantly skimming the top of the water, although they arent putting there fins to the water. The Siamese Algae Eater however, is moving erracticly, swimming upside down, and is laying in one spot immobile, then darting around erratically. What could be wrong?