diff --git a/main.py b/main.py
index 1dd8e09..58d65ab 100644
--- a/main.py
+++ b/main.py
@@ -1,4 +1,5 @@
 from cmath import tan
+from mimetypes import init
 import os
 import io
 import json
@@ -363,7 +364,17 @@ async def fast_get_tank_schema(network: str) -> dict[str, dict[str, Any]]:
 
 @app.post("/addtank/")
 async def fastapi_add_tank(network: str, tank: str, x: float, y: float, elevation: float, init_level: float = 0, min_level: float = 0, max_level: float = 0, diameter: float = 0, min_vol: float = 0) -> ChangeSet:
-    return add_tank(network, tank, x, y, elevation, init_level, min_level, max_level, diameter, min_vol)
+    ps = { 'id' : tank, 
+           'x' : x, 
+           'y' : y, 
+           'elevation' : elevation,
+           'init_level' : init_level,
+           'min_level' : min_level,
+           'max_level' : max_level,
+           'diameter' : diameter,
+           'min_vol' : min_vol 
+         }
+    return add_tank(network, ChangeSet(ps)) 
 
 @app.post("/deletetank/")
 async def fastapi_delete_tank(network: str, tank: str) -> ChangeSet: