i have 2 crocea that i had on sandbed , they had some spotty bleaching , so i moved them up to middle of tank, they looked better for a while, but now ones bleaching has gone from spotty to the outer edges of the mantle all around.....................im using 8 bulb t-5, 5 ab and 3 b+..............................?
bleaching, too little or too much light?
- Thread starter roons
- Start date
spoiledcats
New member
From everything I've read, crocea's are very light demanding and need MH lighting. I have one about 12" from a 150W MH, and was told that even 150W may not support a crocea long term.
spoiledcats
New member
How long have the clams been in your tank?
spoiledcats
New member
By the way, here's a link to an article that mentions some reasons for mantle bleaching. http://www.pemsea.org/downloads_pdf/tc/dec02/art_giantclam_ Licuananetal.pdf
spoiledcats
New member
If they have been on the sandbed for a year, then I think the problem is too little light. Crocea's should be mid to upper range in the tank, and like to be in the rocks, not on sand like some other clams.
there color looks nice and crisp. i don't think its a lighting problem. did you list you phosphate and nitrate #'s? have you changed, stopped or started any additives?
Critterkeeper has reported some local bleaching in wild Gigas that he thinks is from some type of disease but says it doesnt seem to effect the clams and doesnt seem to progress too much, i dont know if this could relate to Croceas but???? how long has this been going on and how fast is it progressing?
Critterkeeper has reported some local bleaching in wild Gigas that he thinks is from some type of disease but says it doesnt seem to effect the clams and doesnt seem to progress too much, i dont know if this could relate to Croceas but???? how long has this been going on and how fast is it progressing?
The steven liu
New member
localized bleaching happens sometimes when you introduce a clam to a new light condition, especially one that is significantly different than its former condition. Probably not a whole lot to worry unless the bleaching area expands.
Puffdragon
New member
It could be the change. I went from 4 110 watt 10K bulbs
to 2 at 10K and 2 at 6500K and I am getting bleaching, but
this normally comes out of it. Had it happen when I changed
out 3 bulbs at once.
to 2 at 10K and 2 at 6500K and I am getting bleaching, but
this normally comes out of it. Had it happen when I changed
out 3 bulbs at once.
saltygeek
New member
So let me see if this is right or if what I've read is outdated etc.
Clams with generalized bleaching all over the mantle is generally form lack of light or lack og nitrate and phosphates?
Clams with local bleaching is caused by shading of a certain area, unknown disease?
Please correct me if above is wrong and also add other causes...
Also, it was said above that the localized bleaching was seen in some wild populations and assumed as a type of disease. does it seem to be contagious? Wondering if many were found in the same areas with the bleaching or if they are just scattered amongst other perfectly healthy clams.
And as roons said is it posible for localized bleaching to ever fill back in?
Any info is appreciated, thanks
Clams with generalized bleaching all over the mantle is generally form lack of light or lack og nitrate and phosphates?
Clams with local bleaching is caused by shading of a certain area, unknown disease?
Please correct me if above is wrong and also add other causes...
Also, it was said above that the localized bleaching was seen in some wild populations and assumed as a type of disease. does it seem to be contagious? Wondering if many were found in the same areas with the bleaching or if they are just scattered amongst other perfectly healthy clams.
And as roons said is it posible for localized bleaching to ever fill back in?
Any info is appreciated, thanks
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