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    | Originariamente inviata da Pelmo   | 
    | normal for 8 fish and a few corals,
 thanks
 
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Sorry, I really cant help you if I don't know how much are you feeding, 
Personally, I have a small tank with 9 livestock, I feed 3-4 pinches of dry fish pellets a day, I use a small size screen.
It's a heatsink, it pulls the heat from LEDs. Yes, there are a couple of magnets holding the covers.