dude everything in this hobby requires fixing, DIY'ing, fabbing up, modifying.. etc etc especially when buying used.. sometimes even when buying new stuff.. if its pissing you off just sell it on kijiji, take a bit of a loss and keep looking for another tank.. if your going to find gratification and a sense of accomplishment from taking that shitty tank and turning it into a kick ass tank then buck up and take the time to get the silicone job done and do the right job the first time and know yourself that you did it right. Then when you fill it up and the water clears up for the first time and your lights are illuminating the crap out of your rocks you can stand back and look at it knowing what a good job you did. either way you go has its ups and downs and they aren't right or wrong and both will get you a sweet tank, but do you want to spend more money and do less work or save money and work harder i guess is what it boils down to.