I have acquired a 20 rimless tank for use as a frag tank. I will have a kessil light over it and run it bare bottom without any sand or rock. I am wanting to have zero livestock in there other than frags (SPS, LPS, and Softies) There will be no filtration other than water changes and a bit of fresh water top off. Is there anything wrong with this? I know in theory it should work but in thought it just seems to simple and could cause major issues later on. I cont plum the tank into my main tank due to space restraints and a sump and skimmer are out of the budget.