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02-18-2004, 04:03 PM
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#1
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
Posts: 20,561
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clam losing colour
my crocea has lost a lot of its colour. it is just paler. it still extends beyond its shell a good inch or two. it is not gaping. other than the colour it seems happy as a, well, clam.  (sorry had to say it) it is a 4" clam. the colour is uniformly paler. this is under 400w coralvue's.
my other clam is doing fine (maxima).
the only thing i can think of is that it is winter time on my reef so the temp is at 75. is this low for clams?
my alk was a touch low, but not unacceptable. 2mg/l it is now up to 3.5mg/l. Ca is at 425ish. all the other SPS seem happy also. this seems like a wait and see, but wanted to make sure.
G~
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02-18-2004, 04:09 PM
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#2
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Reef Freak
Join Date: Aug 2003
Location: Middleton, WI
Posts: 799
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How new is the clam?
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02-18-2004, 04:55 PM
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#3
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Eat more PIE
Join Date: Mar 2002
Location: Florida Panhandle
Posts: 18,610
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Geoff do you have a pic sounds like bleaching 
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02-18-2004, 05:05 PM
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#4
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Big Fishy
Join Date: Apr 2003
Location: Kalamazoo, MI
Posts: 647
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Casey, I keep hearing this term "bleaching," can you elaborate?
AEB
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02-18-2004, 05:11 PM
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#5
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Eat more PIE
Join Date: Mar 2002
Location: Florida Panhandle
Posts: 18,610
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Bleaching can happen to a clam when its enviroment changes or you change salts temp flucuation,different additives added etc etc
usually part of the mantle will turn pale and it spreads slowly but is very hard to stop once started.Kinda like an sps when it gets rtn.
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02-18-2004, 05:18 PM
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#6
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Big Fishy
Join Date: Apr 2003
Location: Kalamazoo, MI
Posts: 647
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Thanks Casey...
Sorry to hear about the clam Geoff,
AEB
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02-18-2004, 10:49 PM
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#7
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
Posts: 20,561
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interesting, but not exactly what i wanted to hear.
i have had the clam for almost 8 months.
any info i can find on this?
G~
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02-19-2004, 12:04 AM
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#8
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
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02-19-2004, 12:53 PM
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#9
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Little Fishy
Join Date: Feb 2003
Location: GA
Posts: 151
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Geoff
Where in the tank do you have your crocea? I ask because croceas need more light than other tridacna. If you have the clam on the sand or toward the bottom of the tank I would suggest moving it higher in the rockwork. Also I have seen croceas change color when under different Kelvin bulbs. Have you switched the type of bulb or upgraded in wattage in the past few months?
AlienDomain
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02-19-2004, 02:42 PM
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#10
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
Posts: 20,561
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i did change from iwasaki's to coralvues. there has been a lot of changes. i did move the clam up on the LR just to make sure that it is getting enough light. i would think 400w would be plenty on a 22" depth tank.
G~
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02-19-2004, 03:08 PM
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#11
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Little Fishy
Join Date: Sep 2003
Location: san francisco, CA
Posts: 192
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After I upgraded my lights significantly, my clam got paler. After a week or so though, it looks back to normal. Since mine returned to its normal color I havent thought much of it since.
D.
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02-19-2004, 03:13 PM
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#12
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Eat more PIE
Join Date: Mar 2002
Location: Florida Panhandle
Posts: 18,610
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Hes probably ok then just keep an eye on him the 400 is plenty light 
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02-19-2004, 04:05 PM
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#13
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
Posts: 20,561
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thanks, i will keep an eye on it.
G~
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02-19-2004, 04:31 PM
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#14
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The Mechanic
Join Date: Nov 2003
Location: New Jersey
Posts: 375
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Hi Geoff, how long is your photoperiod?
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02-19-2004, 10:42 PM
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#15
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
Posts: 20,561
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Hi Eric. 
it varies during the coarse of the year. right now the MH above the clam is on 11-1/2 hours. this is on the short side. January being the shortest at 11hours. June is the longest at 13hours.
G~
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