09-22-2006, 01:32 AM
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How did you acclimate the fish? When you take fish home, it's best to float the bag with the fish in your tank. Turn off the lights in the tank first, then float the bag in the tank. After about 10 minutes, open the bag and add some water from your tank, into the bag. Wait another 10-15 minutes and add some more water. Do this until the bag is full. Then net the fish and place it into your tank. DO NOT POUR THE WATER IN YOUR TANK. The water could carry some harmful pathogens, which you do not want to spread into your tank. Keep the lights off for several hours or even over night.
Some times when you buy fish, the health of the fish may not be that great. This is why it's normally best to observe the fish that you intend to buy. Watch for any physical signs of illness or injury. If possible, ask the keeper to put some food in the tank and watch for the ones eat well. Make sure you select those fish. If you frequent the store, observe the fish over the next few days to make sure they do well. Avoid buying fish on the same day they receive them. The stress of the shipment may cause some casualties. It's best to wait a few days after the store received their shipment of the new fish.
Regarding filtration, it's best to go well above your tank size. For example, in your 46 gallon tank, it's best to use a filter rated for a 75 gallon tank or higher. You can still use the same filter, but make sure you keep up with the tank maintenance and water changes.