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A few comments:
a) The water is pretty darn hard for rams (domestic or wc) if it is 100+ kh/gh.
Can they live in this water - i suppose they might but they won't be able to breed and they might not live.
This is a delicate fish that does best with tds below 100 and 40 is better.
b) The temp...
If everything is all good why are they dying? Perhaps your view of 'parameters are all good' doesn't match what the fish expects or think is good.
Are these frys, 1 inch or young adults. Is the tank cycled? The tails being clamped suggest either aggression or they don't agree with you that...
In truth water that is extremely soft will settle on a low ph. My discus tank claims to have 4.5-4.7 ph and a steady state of 20 ec; though enough decaying matter like leaves will raise the ec. It takes very little to impact ph and/or ec at the low end. Conversely it is very difficult to...
But again do chcoolate gourami require much lower ph or is that just what someone measured and was too lazy to check tds/kh/gh ? I've kept and bred fishes that others stay require ph 4.x at somehwere between 5.7 and 6.1 and had no problem breeding them and keeping them alive.
But this is my question - why is ph an important parameter given tds,kh,gh. ph is a by product of the water chemistry and a given chemistry will reproduce the ph but the ph will not tell you anything about the water chemistry.
If i hand you a jug of water with tds 500 but a ton of co2 to bring...
The motivation for this question is new fish keepers are often confused by ph - they keep trying to lower the ph without fundamentally changing the water chemistry - and this raises the question if you have good water chemistry does it really matter what the ph actually measures even in advance...
My point is the ph actually a useful number or is tds/kh/gh sufficient. The issue is that ph can naturally drift and in the aquarium artifical means can radically change ph - with my favorite example being take 500 tds water and pump in co2 until the ph is 4.7. However relatively speaking...
If you don't want to breed them then don't keep males with females and that will solve a lot of your problems.
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As for your questions - it comes down to individual species as some are more aggressive then others and also individual fishes. I had this little runt of a cockatoo male in a 40b but...
One thing i never understood is why everyone reports PH associated with fishes. My crude understanding is PH is a by product of water chemistry and fishes are more concern with water chemistry then the actual PH. Reporting PH constantly leads to confusion with people trying to lower the ph...
There is this oddity i never understood - being a genus apistogramma doesn't make it uniquely different than any other cichild or dwarf cichild.
While there are certain rules that can be applied to certain closely related species of apisto (organized by groups and complex); most of these rules...
Jeff has them not sure if he explicitly imported them or if they came as part of an import. The only pictures i could find where the ones Miguel posted:
https://apistogramma.com/forum/threads/nice-pair-of-wc-apistogramma-arua-from-aquaticclarity.23453/
Which of course are usually a little...
I didn't see them but i did see something interesting at 7:09 but no clue what species that might be.
I know zero german - despite living in vienna for a year.
Translation of the above (via google translate):
The female fish possesses a relatively sharp head profile, while the male features a red spot on its gill cover; sex differentiation becomes possible at approximately six months of age.
There is a Holopristis guyanensis - weird - Jeff described it as a pretty but nasty fish similar to silver tip tetra. The pictures of holopristis guyanensis looks a bit different than silver tip as whether it is nasty - well i tend to avoid nasty fishes ;)
Both of these tetra are for sale on Jeff's site but i've never heard of them and can't really find any information on them. I think h. sp macheriche is mispelled but the one site that reference it had an unreliable picture and information:
link...
Going back to those yurmies orang tetra; now that it has been another week i ahve two comments:
the plus is they now mostly hang near the top and the red in their tail has significantly intensified - the negative is they eat anything and everything they can get ahold of - the only tetra i have...