I'd like to add some chaeto and a refugium light to my system to help keep nitrate and phosphate down and keep ph elevated at night. The system is 1.5yrs old...57g display with 20g sump. I've been doing 15% water changes every 2-3 weeks. Nitrate 10ppm phosphate .07ppm. The fuge compartment is approx 5in wide x 6in long x 12in tall (water level).