Can Anyone Let Me Know If My Water Chemistry Is Okay For My Fish?

The GH and KH tests can be a bit confusing at first. It sounds like you did them right - add 1 drop at a time until the water in the tube changes colour. The number of drops = number of german degrees, and multply both by 17.9 to convert german degrees to ppm.

Your results are fine for the zebra and pearl danios, though the hardness is really a tiny bit high for the glowlights. Your temp is also maybe a bit on the high side for all three danios.

As for dwarf cories, pygmies are fine at your hardness, like the pH a bit lower (though it would probably be OK) and can also take temps down to 22 deg. Hastatus cories are the same as pygmys while habrosus need the water a bit softer. So for dwarf cories look at either pygmies or hastatus.

Honey gouramis prefer their water a bit softer than yours.



Your KH, at 8, is middling high. The peat may help a bit but you may find you have too much carbonate for the peat to lower things much. Try it and see. Bear in mind that if you alter the chemistry in your tank so it is different from your tapwater it won't be a good idea to a large water change. It is better in these circumstances to do two or even three small water changes a week rather than one big one. So for instance, three 10% water changes rather than one 25% water change per week.

23 - 23.5 deg would be fine. With peat balls, I think they are supposed to go in the filter.

If you use RO, that would reduce both GH and KH, and probably also the pH a bit. The easiest way to use RO is to mix it with your tapwater. As your tap water is hard, you have lots of minerals so you wouldn't need to add any. The way to start using RO is bit by bit so you don't shock the fish with a big change.
Experiment mixing the RO and tap water in a bucket, testing it till you lower both hardnesses a bit. You don't need to go very far, maybe try 1 part RO to 3 parts tap starting off and see what GH the bucket mix gives. If that's around 12-ish german degrees (12 drops reagent) use that to do your water changes for a few weeks, which will gradually get your GH and KH down to the same level. That level GH should be OK for the fish in your list. Maybe instead of doing one 25 to 30 litres, do two 15 litre changes a week till you've got the tank GH to the same as your mix in the bucket. Once it's there you can go back to once a week changes of 25 - 30 litres. Then if you want to lower the GH further, use the same gradual method again.

Glad to help. The thing with altering the hardness is to do it slowly so the fish can adapt to each small change before you do the next one. Once you have the tank's GH where you want it, make sure to use exactly the same tap/RO mix for all water changes to keep the tank water stable.