New Leaf Always Has Spores And Dies

[Deisler]

My fully-cycled tank setting: 120L with 7 Zebra-Danio 6 Cherry Barb 4 Guppy+6Fry 1 pearl gourami
Parameters are 0 0 ~20; 30% water change every week
Temp: 26 degree C
Light: default one came with tank, ~10hrs a day
Nutrition: Dose every 1 week

Tank Setting: http/imageshack.us/photo/my-images/835/img28721.jpg/


I have got this tank for 5 months. Everything seemed ok.

But poor plants got problems.

1. One of them (dont know the name but you can find it in the pic attached) kept having spores on leaves (even on newly-grown leaves for only 2-3days). But it is becoming taller and taller with less and less leaves.....

See pic here: http/imageshack.us/a/img836/1458/25337212.jpg

2. Another one I think it is called 'Cabomba caroliniana'... It grows well but it has no roots at all and kept escaping from the substrate to float up. It dropped many leaves and finally became a single floating naked'stem'..

3. And a common thing for them was many of the leaves were partly covered by some black 'fine hair'. I have no idea what that is and cannot photo it as they are so small....

4. Can anyone recommend some 'hardy' plants please? I dont really want to replant those floating 'naked' stems every 1-2 days and to see my plants are dying...

Thank you in advance for your help!

 

[Ps3Steveo]

1. Looks like Diatoms on the leaves, caused by ammonia.

2. Cabomba likes lower temps I believe so may be the problem with that, I never found it easy to grow tbh and I've grown most aquatic plants.

3. Fine black hair could be black brush algae but without a pic is difficult to be 100%, caused by CO2 fluctuations.

4. Crypts are great, send out runners and fill in nicely if given time to do so, may melt when first put in but will quickly bounce back. Microsorums, Echinodorus species, Anubias are also a good choice but slow growing as with most hardy plants.

Hope this helps.