Okay I have this javafern melting time after time I cut all the leaves they regrow and melt again.. I have the issue only in this tank.. Someone who knows what it is? Co2 looks good.. My fert dosage is around half EI weekly..
I've definitely found that Java Fern does better with slightly higher levels of fertilisers, and harder water. I run my tanks <"very lean"> and leaf size and vigour had definitely dwindled over time. Since I've been adding a small amount of <"Miracle Gro">, they have perked up noticeably.During that time I've had similar happen and was scratching my head but I then upped the fert dosing and it resolved the issue. In my case I put it down to adding some frogbit
Do you dose any magnesium (Mg)? We are unlikely to have much in <"N. European tap water"> for geological reasons.Here is what I dose weekly..
I wondered because it looks a bit like it might have been "leaf burn", either from drying or coming into contact with undissolved salts.Yes but I have it in the lower regions the stay submerged also.
I think you might be right, I don't dose Mg. My tank downstairs has weekly water changes and doesn't suffer from this melt. I think the less frequent water changes create the problem that it runs out of Mg as my tap water is pretty soft?
Yes, soft water is likely to have less magnesium (Mg) than harder water, but it will also have less calcium (Ca) and a high Ca:Mg ratio can cause problems even when you have "enough" magnesium. Some American EI recipes don't include magnesium <"because of geological differences">.I think the less frequent water changes create the problem that it runs out of Mg as my tap water is pretty soft?
That sounds reasonable. I'm not sure the Ca++:Mg++ ratio is that important until you get to larger numbers.Here is my water report it is indeed really low in Mg.. What is the correct ratio for Ca:Mg? I read on aquasabi that 2:1 is good..
If you had water from a chalk aquifer it would have a bit more magnesium and a huge amount more calcium. Have a look at <"Magnesium in tap water">.On that map I live in a white area and the water source also.
Yes I allways use Rotala butterflyI'd try adding 5 ppm Mg for starters, you can use "Epsom Salts" (magnesium sulphate heptahydrate - MgSO4.7H2O). They are ~10% magnesium, so the back of an envelope calculation means 5g in 100 litres. Ten grams in 100 litres would be 10 ppm etc.
<"Rotala butterfly"> lists MSO4.7H2O as an option if you want to try different levels.
It will be interesting to see what happens, it will take a while for the Java fern to respond (just because it is a slow grower). Other plants may show a rapid greening, if they were magnesium deficient.I start dosing 1tsp that would give around 5ppm the tank is +-100L .
If you don't mind mixing your own fertiliser buying in bulk is by far the cheapest option in the long run.n my search online I found a supplier that could deliver buckets of KNO3, KH2PO4 and K2SO4 relative cheap.
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