write the net ionic equation:

3Ni(NO3)3 (aq) + 2(NH4)3PO4 (aq) --> Ni3(PO4)3 (s) + 6NH4NO3 (aq)

I can write the net ionic equation but I've not see a Ni^3+ compound as in Ni(NO3)3. would rather work with a suitable equation. Check your post