Gourami's all died

I bought 10 Blue and Dwarf fish. All of the barbs I purchased are all doing fine. Even the Rainbow Shark is doing well. Thank you for asking. But all of gouramis died but one.
Is my ammonia level too high?

[cocobaby841]

could be 2 high yes r u doing weekly water changes of 25% ? maybe u added to many fish or sometimes dwarf gouramis can have dieases that make them only live for 3months sorry for ur loss get ur water checked for diease and amniona levels good luck

[mtgoat911]

never add more than 3 fish to your tank at one time, always add a paracite tx to your tank when adding new fish
you can by strips to test for ammonia levels, if you level is to high, add a solution to balance the level
what size is your tank?