Hi Marcus,
A year of maturity should be fine, HOWEVER it really amounts to the stability of the system as well. What kind of water parameters do you run and do they tend to fluctuate much?
also what is your lighting set-up? Some clams require lighting more to the tune of MH's but there are many people on this board who have successfully been keeping clams without halides.
I am no clam expert, but purchased my first about 4-5months ago. Derasa clams I'm told are good beginner selections. We have had no problems with ours and we love the colours and growth.
HTH,
Rob
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