01-08-2009, 01:32 AM
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I recently noticed one of my fish has developed an odd lump on his side. He is also starting to develop black spots (not a growth on the fish, but his/her actual coloring). He just isn't looking like himself now... There is a picture below, hopefully you can see his lump...
I have a 30 gallon freshwater tank. It has been setup for about a year. The water was completely changed about 6 months ago, but since then has been empties about half way each month and clean water added.
The tank contains 3 gold barbs, 1 tiger barb, 2 platy, 5 yellow guppies, 3 black tetra. All of the fish have gotten along just fine and the 5 guppies were a recent addition. Previously there were snails (which have since passed and left me with several tiny babies) and two crabs which have also passed due to their daring personalities.
I feel the fish dry flakes twice daily - am and pm. I am using a florescent light and try not to leave it on more than 8 hours (as suggested)