I have a DIY 2 gallon pico that i have built and was wondering about lighting. I plan on keeping small zoa frags and possibly some kind of invert or goby. Help on that decision would be good as well. I would like to put a couple of leds on there but i am not sure what to get so that is my question for you all. It does not have to be fancy just functional. Also can i get away with just water changes and not have any bulky filter haging on the back or is that not possible. thanks for the input in advance.