Hello. First time on forum. In the planning stage need suggestions on making tank secure. So far the plan is a 55gal. w/ L.R.&L.S. for bio., the biggest wet/dry I can get my hands on cheaply (probably 20-30gal.) and in-sump skimmer for mech.. I will need to use a pre-filter as my tank has no built-in overflow. My main concern is securing the pre-filter overflow. Next concern is the lid. I figure a versa-top would work best but they still leave an inch or so of open space in back. Need suggestions on how to best deal with that. I want it to look as streamline as possible.