Oh....water params

pH is 7.6.
temp is 79 deg fahrenheit
nitrates are very low with a 40 Gal/day freshwater drip
O2 levels--must be very high with a sump, overflow/weir, powerhead in the sump rippling surface
substrate is pool filter sand

I have a 540 Gallon acrylic tank with a 12 inch Synspilum, 8 inch Midas, 3-6 inch Argentea, 2-6 inch Bifasciatus, a 12 inch Zonatus--you get the picture. Big Central American Cichlids. I have a good bit of Manzanita driftwood, a large stump a 5 3-4 foot long limbs. A flower pot, 2-3 6-8 inch terra ...