Anyone know a good lights for a 20 gallon long ( 30 x 12 x 12 ) mixed reef? I eventually want to keep acropora and don't want to keep upgrading my light down the road. I also don't really want to spend more than 80$ on a light. i currently have a nicrew light on a planted tank that I am considering putting on my upcoming reef tank with another nicrew light (the lights give off about like 80 PAR at a depth of 12 inches so two would be around 160). is combining two lights a good idea? i also don't want to get more than one light. also, how much par is good for acropora, I'm not thinking the super higher end that need like 500+ par or whatever, just some nice basic colorful beginner acros. thanks in advance!