Problem with water simulation

After i came back from rave on air i imported the tank scene into realflow ready for the water simulation process. I had about three attemps at filling up the fish tank, and all three came up unsuccessful. I set the resoltuion at a high setting to simulate the water more realsitcly, this increases the simulation time abit but not to much to push us off schedule. After leaving the simulation process on for about 21 hours with max particle set at 1000000. The water only coverd a third portion of the fish tank and that was at max particle set at 1000000, which in realflow is an excessive amount of water particles in a scene. I tried several times to solve the issue of the water particle only filling up a small section of the fish tank but every attempt to fix it would increase the time wasted on solving the problems as i would have to wait for each test to simulate. After several tests i found out the cause of the problem was that the scene file with the fish tank was huge. The actual fish tank itself exceeded the original size as we had planned for, we only found out the true extent of the size of the fish tank when it was imported into realflow. The alternative for us would be to use the dynamic system on Maya, the Maya version im using at home is 2009 and is abel to use the Ndynamics option which is a new feature in Maya 2009. Ive had a word with Ash and he said if worse comes to worse hell try to simulate the water with lighting which i think is really clever.