I never fed mine directly, but I fed the tank phyto regularly....I can tell you to watch out for microbubbles getting on the sponge. They eventually made mine turn for the worse and I got rid of it before it starting deteriorating too bad. HTH
Yeah also make sure you never expose them to air. Make sure your P04 and nitrates stay low to ward off "unwanted" aglae. My buddy had one that got covered in hair algae and died.
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