Im going to be getting a 75 gallon tank. Will 10 clams be enough

10 will not be enough. At least 50, better at 10 clams for every 10 gallons.

I have gravel only in my tanks, can they live in a tank where they can't bury themselves?

They can still bury themselves in coarse gravel.

Lifespan and will they reproduce?

Asian clams, also called “golden clams,” are round, yellow-green to dark brown colored shellfish with thick, concentric rings on their shells. The clams are typically small, less than 1.5 inches in size on average, and have a life span of one to seven years. An Asian Gold Clam can live a year or so in good conditions. Some hobbyists say they’ve had luck with clams living upwards of three years. Other hobbyists have had clams last about three of four months, and some die shortly after being introduced to a new tank. Its really hard to say much for sure regarding a clam’s lifespan, because a lot has to do with water conditions, the clam itself, and plain luck. Its a good idea to hope for about one year, and if the clam lives longer, its a bonus. The only time you can breed clams are probably in large scale ponds or tubs. It's very rare to have a clams release sperm and eggs in aquarium, create the larvae, getting through that stage, feeding them the planktons, and to finally raise them.

ASIN	B0B6HHYQ8D
Age Range (Description)	Adult
Age Range Description	Adult
Animal Food Diet Type	Raw
Best Sellers Rank	#38,040 in Pet Supplies ( See Top 100 in Pet Supplies ) #372 in Aquarium Water Treatments
Brand	Generic
Brand Name	Generic
Breed Recommendation	Small Breeds
Container Type	Carton
Customer Reviews	4.0 out of 5 stars 236 Reviews
Dog Breed Size	Small
Flavor	Seafood
Included Components	Insulator Bag, Reusable Ice Packs
Item Form	Clam
Item Type Name	Freshwater clam
Item Weight	1 Pounds
Manufacturer	Live Florida Clams
Number of Items	10
Occasion	Birthday
Special Ingredients	Clams
Specific Uses For Product	Aquarium Filtering
Unit Count	10.0 Count

10 Baby Live Freshwater Clams: Perfect for Aquariums and Ponds Brown, Gold, Tan, Silver 1 Count (Pack of 10)

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