Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Phosphates can come from fish food's, fish poop,fertilizer's,tap water,some buffer's.
Number's for ammonia,nitrites,nitrates,pH,GH,Kh are more telling than opinion's (ie) good,same,normal,within ranges,etc.
If neutral regulator did not budge pH,GH, then perhaps water is not suited (Too hard/alkaline) for rummy nose tetra's if these are only fishes affected.??
Stupid high phosphates and or excess of near anything might have negative effect on fauna if how it affect's their environment is sudden or persistent.
Don't believe phosphates alone at level's suggested in near any nutrient dosing scheme have been associated with many fish death's.
Would in my view need zero uptake by plant's,and way overdosing to see such number's as mentioned.
Too much of lot's of stuff can have negative affect on fishes along with long list of other variables often not considered (ie) maint.age of fishes,new fishes,chemical's added,poor maint,poor nutrition,etc,etc,.
Would be thankful if death's occur with only a few fish in one tank as opposed to pathogen suddenly introduced ,take more fishes.
If tank/fishes was running fine before the attempt to adjust the parameter's,I think the every couple day's water changes will restore thing's to original chemistry and be closer to stable with that source water used minus the neutral regulator.
I'm not too keen on messing with my water but just keep fishes that can thrive with the water I have readily available from the tap. (tap and tank's close to same,same)