What is the nitrate level in your tap water? If that is also 25 ppm, all the tank nitrate came in with the tap water rather than being made by the beneficial bacteria.
Don’t miss out on the best deals of the season! Shop now 🎁
the filter is a Juwel bio filter & the bio pads are just like a mechanical pre filter the go on the top layer of the filter stopping coarse dirt from going deeper into the filter. It says they should be changed weekly.What are the bio pads? Filter usually has filter floss and sometime ceramic rings; if the bio pads are filter floss it should not be replaced that often if at all.
If the temp was still 25 it is quite understandable that both rams died and a bit surprising it lasted that long. It sounds like the gourami became ill a few days after you purchased the rams and it is quite possible they had some sort of disease that spread to the gourami. As to what specific disease it is hard to guess.
How can I lower it then? All my other fish seem to be doing just fine - harlequins, danios, Molly’s, tetras, plecs & corys.The pH is to high for these fish. They need acid tanks. The tank has to be well established and the parameters need to be stable.
What can I do to lower the nitrate?Hanging around by filter outlet sounds like ammonia or nitrite issues. 25ppm nitrate will kill your fish only very slowly, in the bad old days all the books suggested 40ppm was your aim and water changes were necessary at 80 or even more.
But I was told I couldn’t keep live plants due to the low hardnessAim to have 30-50% of the volume of your tank in live plants, that is a good starting point.
Depends. First test your tap. I know some people in England have high nitrate in their tap water; if so then don't worry about it. 25 isn't that bad; and I've kept rams for multiple years in water with similar nitrate. The ph is also ok; while rams do prefer soft acidic water and require softer water to breed they can survive long term in ph 7.5. Personally rams don't fit with your other fishes with regards to temperature requirement as well as special care so i would not worry about the specific optimal condition for rams and look for something that is more suitable. I would recommend opal Borelli apistogramma which are quite suitable for your tank and quite colourful. I would not get a female just a single male. You could get multiple male if you want. They are smaller than the rams but close to being as colourful and are far more hearty.What can I do to lower the nitrate?
Do you know the gh kh? I presume your 'softner' uses carbon to filter out some minerals? The ph might be artifically raised to prevent lead pipes from oxidizing. If the kh and gh are very low you could lower it with a bit of peat but please don't go this route it isn't necessary and it will create other issues that you have to address.But I was told I couldn’t keep live plants due to the low hardness
That's a salt based water softener. It exchanges the hardness minerals for sodium. Unfortunately this is not good for fish, especially soft water fish which have not evolved to cope with sodium in the water. It's not good for humans either (we are supposed to limit our daily salt intake) so there should be a bypass tap somewhere for drinking water.Sodium taken from the Harvey™ block salt completes the exchange.”