Hi there i have the same problem , im goona put mine in shed , i read on one post someone built around his tank , you could always lay some slabs down then build round , making sure the tank is higher up , so you are not struggling to fill containers unless you have transfer pump , i also seen dark green storage tanks what they use for oil , im not set up myself but all the knowledge i have looked at on this site and another i feel like i know a fair bit already cheers guys .