hello all , my deresa clam is giving me fit's, it's 1 year old open's up good but section's of the mantle don't extend fully & i believe it's pinching. it all started when i went from a 30 gal to a 55, it won't attach anywhere i place it and has fallen over everywhere i place it. my 2 crocea clam's are doing fine should i do a fwd or any other advice would be helpfull, thank's.