Describe please for us what is in these trays....most setups these days have little to no mechanical filtration. Bioballs, sponges etc. can quickly saturate with debris and leach nitrates back into the system. Also I imagine that a herd of horses like you have require quite a bit of food to keep them happy. Do you have a skimmer? If so, what kind and what size tank is it rated for?
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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