Gr8KarmaSF;1711595; said:300 is a good start. Just kidding. Depending on your age and money situation try to sit with them calmly and tell them how this is a passion of yours and how it would be nice if you were supported. Compared to everything else going on in todays world its a great alternative to other more insidious things that one could get into. You can also show them how it will make you more responsible in terms of what it takes to take care of such a big project.
If they dont go for it then suggest a happy middle ground, how about a 240 as a show of good faith?
im 14 and i know a guy with a 300 w/ stand and full setup (lights and filtration and decor) for $200. id jump on this but my parents need to be convinced. this is the goal of this thread.