06-03-2008, 08:47 PM
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Cloudy water is an indactaiton that your tank is going through an Ammonia bloom. This is poisonious to the fish. Also, you should be do daily water changes in that tank to keep the ammonia down, and since it is only 1/2 gallon. You are going through a cycle right now, and daily WC's of 50-90% are needed, if not 100%. I'm not sure a still water 1/2 tank will even go through a cycle, though.
The white string may be a sign of fin rot, which is a sign that the water quality is bad.
And, try to get your betta on pellets. Flakes dont have the whole nutrional value that pellets can offer. Dont feed him anything but the pellets untill he accepts it, and then you can vary his diet, but staying on the pellet as a staple.