01-31-2008, 01:45 AM
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Get yourself a covered bucket, clean and free of any detergents or contaminants. 3 - 6 gallons can usually be found at hardware stores for a few bucks. Rinse bucket completely, then fill with tap water. Use methylene blue and fungus eliminator, dosed according to the instructions per gallon, mix well, let sit about 10 minutes, then mix again. Use this water to do 100% changes in his bowl every day for 7 - 10 days. If you can warm up his temp to at least 78 that would help a lot.
There are a number of causes for this to happen in an otherwise healthy fish, and poor water quality is a prime cause, along with cold temperatures. 72 is a bit lower than most bettas can handle, it weakens the immune system and makes them prone to bacterial and fungal issues. Bettas do best at about 80 - 82 degrees, and in a small heated tank where temp can be controlled. They need decorations and caves to hide in, play in, and just protect as their territory. Bettas get bored, they need attention, just like any other pet. Rub your finger in slow small circles once he's feeling better, and watch how he learns to come to you when you "call him".
You mentioned you are feeding only bloodworms... this can cause health issues also. First of all, bettas need more nutrition than bloodworms alone can provide. Secondly, bloodworms (both frozen and freeze dried) are very dirty, and tend to pollute the water quickly. This leads to waste build up, poor water quality, etc, in spite of the weekly change. Try a betta pellet food instead, mixed with treats of brine shrimp (frozen or live doesn't matter) and daphnia, and live blackworms if you can find them available. If you're not sure what the blackworms are, let me know and I'll post a link for you, with picture. If feeding a frozen food, be sure to thaw it in a cup of room temp water for at least 15 minutes before giving it to your fish. If the food is too cold it can put their body into shock as they injest it, as it causes their body temp to drop drastically.
This should help bring your betta back to life quickly, but I strongly suggest investing in a small 2.5 - 7 gallon aquarium, something large enough to hold a heater, and small filter with very gentle low current.