Ok so i have a 20 long packed with fiji and mixed rock, i have a heater set to 76 degrees a maxijet 900 at one end and an aquaclear 50 at the other end for filtration and circulation, light is just a super old power compact daylight. Im dosing purple up nightly and just wondering if there is anything else i should be doing i want to get this rock colored up for my seahorse project soon to come. Do i need to set a lighting cycle? Is a certain PAR needed to obtain coraline. Thanks