People never seem to surprise me..... its a lid for a 20 gallon just buy one ....its not like ur buying a lid for a 500 gallon tank.... majority of the options members listed above are good options for larger size tanks when u run into a great deal of $$$ but for a 20 gallon its gonna be just as expensive as a regular glass lid...honestly if people cant aford a simple glass lid for a 20 gallon can they afford to run, feed and do maintence on the tank?