Causes of hair algae?

Hi Dudes & Dudettes,

Bout 6 months ago I set up my big tank, 115 UK Gall (plus 15 in the sump)

Everything was perfect, nice growth, minimal algae.

Just this last 3-4 weeks though I've been suffering some hair algae and it's getting a little prolific. At first it was just a few strands on some crypts, now it's getting onto most things; long strands upto a foot or more long

In an effort to knock it back, I've been removing it manually and then doing thrice weekly w/cs, dosing 60ml of Excel after each w/c. However, it keeps coming back so I've obviously not bottomed the cause. As always, there's lots of contrary advice on the net about it's cause, so:

I've got three 70w 5200k MHs above the tank, 6' x 2' x 2', raised about 18" of the surface.
I inject CO2 via a Mazzei injector attached to a 2500 lph pump, which feeds into the return pump, a 3500 lph Aqua Medic unit. I get a nice steady mist of CO2 thoughout the tank. Moving the drop checker around shows it to be nice and evenly spread. The water is returned to the tank via a spray bar made out of 3/4" pipe with holes drilled to drive water down into the tank. There are also two down legs with spray holes to drive water round the tank.

The substrate is a thin layer of pond compost, bout ½" deep, then 2" of Aqua Medic Volcanit and then a topping of some fine black gravel, about 1mm grain.

I'm dosing EI. However, my tap water has quite a bit of N (average 25ppm) & P (1-2ppm) already in it so (on my normal schedule) I tend to dose just a bit of K2SO4 (3.5 gms) after a w/c on Sunday, then 8.5 gms KNO3 & 1.6 gms KH2PO4 on Tues & Thurs. I'm using Aqua Essentials trace mix.

Stocking isn't too dense, I think;
7 Discus, ranging from 2" to 4",
2 Elephant nose,
20 Neons
10 Black Neons
10 White Clouds
1 Farrowella
I put a dozen shrimp in but I don't know how many are left!
There's also 2 or 3 Nerite snails.

At first I thought it might be overcrowding but I don't think so. I feed them quite lean and anything going in is cleared in no time. They get live or frozen bloodworm, daphnia or brine shrimp, along with some Tetra Prima or cichlid pellets, or sometimes some dried tubifex which they go nuts for.
The only problem I have is vacuuming the substrate. I use an Eheim Gravel Vac which is quite good, if a little slow. I tend to do a third of the bottom at each w/c but it's so heavily planted I have trouble getting amongst the base of the plants so I'm thinking there's detritus building up there.

The tank is very heavily planted with a range of plants, notably three large swords, some groups of hygrophila (a big Corymbosa and lots of Difformis which I keep potted to avoid disturbing the substrate) Loads of Crypts and two big bits of bogwood with lots of cover with Java Ferns, Anubias & Bolbitis. I also have a good group of Ludwigia Glandulosa and Alternanthera which have now broken the surface and grown out of the tank.

Any suggestions coz I'm at a loss. There's been no trouble with the tank 'til now and I'm surprised that the 3x weekly w/cs & Excel dosing hasn't touched it. I can't think of anything I have done though after six months the substrate has obviously matured.

 

Morning,

Still having grief with my tank!

I gave it a thorough overhaul 10 days ago;, pruned, cleaned off all the hair algae, thoroughly vacuumed the substrate (there was a lot of mess) and continued with my w/cs every 2/3 days & Excel dosing. For a few days all was good. Now the hair algae is returning.

After a good long trawl through some of the posts here, I'm starting to think I may not be getting sufficient flow through the tank. CO2 seems to be good, a nice light green on my drop checker and a nice visible mist of CO2 is coming into the tank.

I have an Aqua Medic OR3500 pump in the sump which is returning water to the tank using 3/4" pipe (about a 2½ yard run along the back of the tank and up) and a head of about 3½ foot. In the tank, the 3/4" pipe runs along the back with some 3 or 4mm holes drilled in and aimed down the back wall. There are two 'legs' running down with spray holes to try and circulate the water round the tank.

This is my first big tank I've set up so I'm still learning.

I was thinking of replacing the run from the pump along the back with 32mm pipe, then tee-ing off to two 20mm spray pipes, one along the front, one along the back. This I hope will improve water/CO2 distribution. However, before I spend more money on this I wondered if anyone has any other suggestions?

Brian

 

Hi,
thanks for the replies.

My water readings are taken both from my own readings (always suspect) but also from my local water company's annual report.

My CO2 currently comes on 1½ hours before the lights; CO2 is up by the time the lights come on. I have a pH monitor which records a nice steady figure for most of the day. It raises to around 6.8 overnight but falls again to around 6.4 by the time the lights come back on. It only falls slightly more than that through the day. Whilst not indicative of the level, it demonstrates that it's somewhat stable.

The swords were given a good 'hack'. I had let them run away a bit.
I have been water changing / Excel regularly but hadn't tried a blackout; I didn't think it was effective against this type of algae?

I'm also trying to work out why this has occurred now, the tank's been stable for months.

 

Morning again.

Today I gave the tank another good clean through, changed water, dosed Excel and covered it up.

I've being trying to reckon what caused this outbreak. For six months the tank has been perfect, then a month ago, bang. Many of the plants were doing really well; my Anubias & Swords were flowering. I also got some long trailing flower stems which I think were from my vallisneria. Both my Ludwigia & Alternanthera had reached the surface and really took off. Then the algae appeared and plant growth seemed to fizzle out.

Whilst vacuuming the gravel I've noticed a lot of snail shells. A few months back I got a snail infestation; must have come in on some plants. I didn't worry too much and just took out the excess I noticed on the glass. Then most seemed to disappear. Not sure what sort of snails they were but if they were algae eaters then there wasn't much algae for them and they may have died back. If so then it's typical, the ammonia boost has given them plenty!

Also, when I gave the tank a big clean up a fortnight ago it was a very hot day. I took out the bogwood and pruned back some of the excess growth on the Anubias, Bolbitis & Microsorum. They were out for an hour or so and it looks as if they dried out and died back. Today I pruned off the now dead leaves. Fortunately there's plenty of new growth on the rhizomes, except for the Bolbitis which I think may be beyond recovery.

The only other thing I can think of is I turned up the temperature to around 27/28°C for the benefit of my Discus.

Tom, what did you mean by 'think about that CO2 redo'? Do you agree that the return piping cold be better?

 

Hi all,

My tank has now been covered up for a few days. I'm gonna uncover it tomorrow and see how it's doing.

When it started going downhill a bit the swords, which had been really growing strong, started showing signs of problems; leaves looking a little brown & holey. They also looked torn for some reason.The rest just started hosting hair algae! I've removed the three swords for now but I'm thinking of getting a single example to replace it.

I had been dosing 8½ gms of KNO3, 1.6 gms of KH2PO4 & 2.1 gms of AquaEssentials traces mix, thrice weekly. I had always thought this adequate so it's CO2 that's not being supplied fast enough for the now bigger plants? I did increase CO2 supply several times over time.

This is my first experience with such a big tank. As I said in the earlier post, would it be a benefit to lay out the return pipe differently? CO2 is mixed in using a Mazzei Injector which is then fed into the return pump and hence to the tank. However, it driven down the back wall of the tank. It may have trouble reaching the front. It was satisfactory until recently but it must be showing it's limitations when the growth is not kept pruned back. How do you lay yours out?

Brian

 

Everything looks good again now after the blackout.I didn't realise that worked for this sort of algae! Most of the hair algae just fell off; I found it wrapped round the overflow comb and in the filter sock!

I'm still considering how to layout the return pipe. I think some of the problem could be slow water turnover and movement in the tank. It's fine at the moment after a heavy prune but the heavier growth requires more demands on the system and contributes to slowing circulation?

There are just so many different configurations to consider. I've been looking at either a second spray bar along the front of the tank (would increase flow and CO2 distribution but would look unsightly) or maybe just removing the spray bar and using one (or two) shaped outlets, like Lily pipes. (problem here may be too strong a flow?)

I've looked on various sites but most advice seems geared toward marine tanks.

 

Well, after the cover up all is again well, no algae and nice clean growth.

I gave everything a good prune. I remove the three swords and replaced them with a single, smaller growing veriety. The vegetation is now much less dense. I'm gonna let it grow on again and see at what point trouble starts again. I suspect there's a threshold upon which supply can't meet demand. However, CO2 is being supplied fairly well; it only takes a slight increase in supply rate before the fish show signs of stress; gasping and lingering at the surface.