Keep in mind that we haven't built your tank yet, and that we will send you a complete set of detailed drawings of your tank via email ASAP upon receipt of your payment, and that we won't begin fabrication of your tank until we receive an email from you stating you're good with what you see, so you can make perfectly sure that what we will build fits what you need. If you need to effect any minor changes to your tank's overall dimensions, and by 'minor' we mean a couple of inches more or less in any dimension, and any kind of changes to the fitting position or orientation on top of it, those will all be included in the price you pay. In some rare or extreme cases we could contact you with a build surcharge if the changes you need will make it cost more for us. So up to your recent tank purchase nothing is written in stone and there's always space for negotiations, should you need them. That changes when you accept the tank's drawings, as from that point on we won't accept any changes and won't accept any tank returns. So make sure to check twice all measurements and fitting positions upon receipt of your new tank's drawings.