You cna put them in any of your tanks, though if and when the Molly grows up it will probably eat your shrimps.
Also would you want millions of MTS? Unless you have a snail eating predator, but most snail eating predator eat shrimps too.
You do not need to put crushed coral unless you water is ridiculously acidic or soft.
MTS if you mean trumpet snail pose no threat, but only contribute to your bioload. Do not eat any snail-eating predator, that is all.
Also would you want millions of MTS? Unless you have a snail eating predator, but most snail eating predator eat shrimps too.
You do not need to put crushed coral unless you water is ridiculously acidic or soft.
MTS if you mean trumpet snail pose no threat, but only contribute to your bioload. Do not eat any snail-eating predator, that is all.