In my old tank which was heavy stocked my nitrates were 80-100ppm with no problems and the rays bred in that
I don't think nitrates have a big impact on rays but it's best to do 2 x 25% water changes per week not to just lower nitrates but to freshen up the water
A drip is perfect
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Yeah couldnt do a drop but Im going to start doing 30 percent water change every 3 day
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