They will likely not survive in your tank unless you can supply them with live food. If you can't I'd suggest taking them to a bay and releasing them where there are structures and vegetation for them. This will give them the best possible way to survive.
Here is some info about your seahorses:
Virginia Living Museum:
https://thevlm.org/portfolio_page/seahorse/
Lined seahorses Hippocampus erectus – Lined seahorses (Hippocampus erectus) are native to Virginia but local populations are in decline as they are throughout their range.
Chesapeake Bay Foundation:
http://www.cbf.org/about-the-bay/mo...chesapeake/the-lined-seahorse-a-rare-romantic
The Chesapeake Bay is home to a single species,
the lined seahorse, which is classified as threatened by the International Union for the Conservation of Nature. Lined seahorses get their names from their zebra-like stripes. They range from Nova Scotia to Uruguay, grow to about eight inches in length, live about four years, and are masters of changing colors to match their backgrounds.
Laws & Regulations
Our native seahorses have varying levels of rarity and protection throughout the United States and Outlying Territories (listed above), and laws vary from State to State. There are currently no seahorse species listed under the Endangered Species Act, although dwarf seahorse is being
evaluated for possible listing by the
National Marine Fisheries Service (NMFS).
In addition, the genus
Hippocampus was listed in
Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (
CITES) as of 2004, based on a proposal put forward by the United States. As part of the listing, CITES Parties agreed to a voluntary
minimum size limit for wild-collected seahorses
, which the United States adheres to. This minimum size limit is designed to discourage people from harvesting immature seahorses that have not had a chance to reproduce and contribute to the population. To read more on this CITES recommendation,
click here
.
CITES regulations also recognize that
international trade in captive-bred seahorses
, rather than wild, reduces the collection pressure on wild populations.
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