what would be a nice 2nd 'final' clam?

i got a 90 gallon, 2-250watt de hiqi

i have a derasa for about a few months now, i see nice extension, i see new growth...

i am wanting another BOTTOM dweller clam.. basically i just want a 2nd or 3rd final clam for my 90 gallon. which clam will grow big? well relatively which one is best suited?

i am thinking of either a maxima or a squamosa..

where was that link that descrbed a bit of eat?? i lost that link

thanks..
 
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