There's a lot of hardened black algae or film on almost all of my Anubias and Hygrophila, some on the java fern leaves. The tank does not have CO2 injection and has 4 - 21 watt T5s (3 - 6700K and 1 Colormax). Filters used are two Aqua Clear HOB filters. Is this caused by poor filtration? Or too much nitrate due to overfeeding?

The leaves of the Hygrophila Stricta are pale green almost light yellow in color. Will CO2 injection help get rid of this black algae?

How big is the tank? Without knowing that it is hard to guess what the problems are.

The tank is 55 gallons.

80 watts on a 55 gal could certainly do well with Excel and/or CO2.

You can do not CO2 approaches, but you will want to read the non CO2 article in the article's section here.

That will tell you more or less what you need to do.

Regards,
Tom Barr

I've read the non-CO2 articles, I don't do water changes ,just top off for evaporation. I did this tank for a friend but I don't know how much he feeds the fish. The dosing is every 3 days, Flourish excel,Flourish, Seachem Potassium and Nitrogen. I might add CO2 injection but I want to try out the low tech way of no CO2 injection.

What do you use for phosphates for the plants? For the light level you have, the plants aren't going to grow really fast, but they still need some phosphate. Also, once you get plant leaves infested with algae you almost always have to prune away those leaves before you can get control over the algae. You can kill the algae on the leaves, with a 1.5-2X overdose of Excel, but the leaves will mostly die anyway, which will lead to more algae later.

My 2.5 gallon nano uses Excel for carbon, no CO2, relatively low light, and the plants in it grow very slowly, but almost entirely algae free. I dose KNO3, KH2PO4, CSM+B traces, and Excel in it, every other day. It has a 27 watt PC desk lamp about 6 inches over the water. So, you should be able to make your tank grow algae-free.

When you use Excel, you are not doing the non CO2 method even though technically it's not adding CO2 gas, it still breaks down into CO2.

You can do and should do large weekly or once a month/2week water changes, you need to dose more and a source as Vaughn said, of PO4.

I'd go 2 weeks and do 50-60%, dose about 1/4 EI(2x a week or 4x every 2 weeks).
That with a decent fish load ought to do it.

When you add Excel, it increases the growth about 3x that of a non CO2 tank, so you need to add more nutrients. That means a higher change of build up, so the water changes come back into the process.


Regards,
Tom Barr

So if I really want a non-CO2 low light planted tank, I should stop dosing Excel and just continue with the ferts. I would also not do water changes. Did I get the concept right? I don't dose Phospate,just Seachem Potassium,Nitrogen and Flourish.

You still need PO4, not much, but some.
Some GH booster is also par for the course, see the article and stick to the advice contained in the article.

You'll dose once a week at most and then pretty lightly.
Add algae herbivores, SAE's would be good, Amano shrimp etc.
I'd trim off most of the infected leaves, add fresh plants, cheap ones etc till the other's slowly grow back etc.

Regards,
Tom Barr

Tom,

After reading this post, I am curious if I have the same thing. I'm posting a few pics. I don't know if you remember from my other posts here, but I am just now getting my tank to where it 'should' be. I made your DIY reactor the other night and installed it. I ordered ferts from Greg, which shipped and should arrive in a few days, I've increased my lighting by OD'ing my two 40 watt t12's plus the single t5 38 watt.

So, I'm expecting to start getting some good growth finally once this is all started, but I have algea on almost all my leaves, with the exception of the crypt for some reason and the java fern. But the anubias, the sword, and the long tall I don't know what they are in the back.

Anyway, as I'm writing this, I'll bet I'm going to be guilty of the 'write before you read' sin, so if it's here, just yell at me and tell me to search. But if it's not here already, then what should I do once I get the ferts going? I was assuming I'd let everything start growing strong and then trim away the bad stuff. If I trim now, there wouldn't be much of anything left. So, what do you think? What is this stuff? And how should I attack it?

Thanks,



This anubias is growing a new leaf right now, though it's not in the shot:


What is this long tall single strand each thing?:


Here's the overall of the tank before the reactor install: