I purchased this tank at walmart. I am trying to figure out if, for the included filter, i'll need to buy cartridges to replace the one in there? i believe the filter is by Whisper, and the tank itself is Aqua Culture/Hawkeye
it is a one gallon tank, and he seems to be doing quite well in there. i've had him and the tank since last saturday, and i've done one 50% water change so far. any other tips for me?