Take a look at the inside of my overflow grate! WTH

SeaTila

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1.5 months ago I woke up to my large anemone sucked into a maxspect 150. I had to pry it out and the maxspect clicked after that. I replaced it with 3 mp40s. I was bummed...my clownfish loved it and it was big and healthy from what I could tell. It was white...dug into sand and had hot pink flouresence on tips.

Scooped up tentacles, changed about 50 of 200g that day. Nothing else died. I added good bacteria and all seemed fine except a couple of weeks later started to get cyno and maybe dino. I was agressive with changing 100micro socks, blowing ot off rocks etc and wet skimming but keeping it away has been difficult. I noticed phosphate sponges were helping but moved to gfo/carbon reactor. I was doing water change today and noticed something in return pump guard. Then found white things in intake in sump where it comes in before microsock.

Then I pulled off the grate of the overflow and turned it over. These look like tentacle pieces and they appeared alive or growingo ...with the start of growth on one end and adhered to inside of grate. So weird. I scrubbed it out and think its anemone tentacles but not certain. I have other nems doing well growing great color and nothing else is missing tentacles. So for 6 to 7 weeks these have been in tank grate. Im concerned about pieces clogging inside my one small overflow pipe so likely will pull pipes tomorrow to check. They were not easy to remove from grate out of water so hope I don't have any in overflow pipes to sump.

Anyone else see this before? Is this also how they propagate instead of simply splitting. I didnt think about it but while maxspect was clogged it was not moving so low flow may have helped the tentacle pieces stick to grate before I figured out what happened.
pic to be attached soon
 
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Those all look to be sponges and completely fine, they should grow back, they were helping filter your water.
 
Those all look to be sponges and completely fine, they should grow back, they were helping filter your water.
Hope you are right. I was concerned about worms or larve of some sort. I have sponges in tank but not like this. And old tank I moved from ...never saw these before.

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Thats what it is! Saw other posts. So this is no big deal and my anemone is not coming back lol. New sand..new tank...liverock and inhab/fish moved from old tank. I thought my tank wouldnt need to cycle but phos & silicates are causing new tank surprises. Thanks to you both in solving the mystery so quickly.

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