Hitchhiker ID Please

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Hi can someone tell me what this white thing is under my acan? The acan shrinked when I scraped the glass nearby and then I noticed this for the first time. Should I remove or let it be? Thanks

IMG_0437.JPG
 
www.dinkinsaquaticgardens.com
Pineapple Sponges. Harmless filter feeders
 
Yeah, pineapple sponges. I used to have hundreds of them, but they've all gone now, both in sump and DT.
 
Top Shelf Aquatics

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Reef by Steele, Pods Starting @ $19

HOW MUCH DOES A FISH’S FEEDING REQUIREMENTS AFFECT YOUR STOCKING DECISIONS?

  • A lot! - I avoid fish that require frequent or specialized feeding

    Votes: 17 34.0%

  • Quite a bit, but an automatic feeder can change my answer

    Votes: 6 12.0%

  • It depends on whether my nutrient export can handle it

    Votes: 7 14.0%

  • It depends on how badly I want the fish

    Votes: 11 22.0%

  • Not much. I’m willing to adjust my routine

    Votes: 9 18.0%

  • Not at all. Feeding demands don’t limit my stocking choices

    Votes: 8 16.0%

  • I usually learn about the demanding feeding schedule after buying the fish!

    Votes: 2 4.0%

  • I haven’t really considered this before

    Votes: 4 8.0%

  • Something else (see my comments in the thread)

    Votes: 1 2.0%
See comments…

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