I started my first tank this year in the last few weeks have developed blanket weed it is sticking to everything from glass to plants, I have 4 or 5 different plants including a couple of grasses, sorry don't know the names, the fish are 4 swords, 4 bueosaires tetra, 3 tiger tetra, 6 corydoras. Tank is 61 x 41 x 30 cm. Can you give any clues as to what I should be doing to eradicate the algae, it looks like pond blanket weed to me. I have an external filter tank and a UV lamp. Thanks Bob.