Hitting the first problems and finiding solutions

By mid-November, the newly set up, fish-free tank already showed some problems, the biggest being the appearance of fluffy clouds of dark green algae along the surface of the substrate. To counteract this, I suggested reducing the lighting period (which had been set to around 12 hours by the family) to 10 hours. I also gave them some Spirodela spp. which is a type of giant duckweed that can have a nice red tinge and a bottle of EasyCarbo, a liquid carbon fertiliser which also acts as an algaecide. We then manually removed as much algae as possible while doing a water change and left it at that. I also gave them some sera Florenette A root tabs (which are best value for money), two of which were inserted into the substrate at the time.

In that 6 or so weeks, some of the plants settled in nicely and some died off. Mainly, the Limnophila sessiliflora tried to take over the tank, while the Bacopa lanigera, Lindernia rotundifolia and Lysimachia nummularia ‘Aurea’ died back heavily. This corresponds with my experience that without investigation and special attention, some plants just take to some tanks while some just don’t.


The other problem that the family encountered is high levels of evaporation as can be seen in the photo below. With the tank temperature set to 24°C, this was unexpectedly high as I get considerably less evaporation in my “hot” tanks. The problem with topping up is that it increases the water hardness in the tank, and disturbs the substrate, but this was resolved later.

In the mean time, I had failed to find my background for this tank, so it was looking a bit bare without one. The sagging lid was also irritating everyone.


Restarting the 60 litre project

Following a rather unfortunate end to the 60 litre project, I have now re-set it up at a friend’s house for their 5 and 6 year old children. The parents have the previous white-ups from this project for reference, and my advice, in person, on demand. Their life style is relatively busy, with little free time, so we’ll see how a fish tank fits into their schedule.

We set up the tank with the 5th of October. I wanted to use Moler clay for the substrate because it resembles the popular gravel more closely than sand would. It should also keep a higher bank at the back more easily. Moler clay is a ridiculously dusty substrate which is sold by some aquatics suppliers, but is also available for the bonsai tree hobby as a substrate for the plants, as cat litter (which may be fragrant) and in some other industries as well. Moler clay, which is calcinated clay consisting mostly of diatomaceous earth from Denmark, supposedly has a high cation exchange capacity. In simple terms, this means that it will extract some nutrients from the water column and make them available to the plants through their roots instead.

I was reminiscing about one of my first tropical aquaria around this time, which was set up in the early 2000s. I was using Dorset pea gravel at the time and as it sat in the corner of the room, I created two tiers: a 1 cm layer of gravel at the front and a 10 cm tier across the corner which was propped up by oak branches and had a “cave” from a plastic pot that was cut in half. As this tank will be viewed mainly from the front (from the dining room, across the lounge) and the right side (from the sofa in the lounge), I decided to try for a taller tier at the back-left of the tank sloping downwards to the front-right and only a little substrate at the front. I’m hoping this will allow the higher tier to be planted heavily, while keeping the front clear for viewing and feeding. I was recently lucky enough to acquire some dragon stone at a good price from another hobbyist, and wanting to involve the children, I let them pick out a few pieces for the new tank. These now line the tank about a third of the way to the back, and from the left side to three quarters across the tank.

Next came the plants. The children, stayed relatively engaged while washing the substrate as they enjoyed plating with the hose and getting soaked (in October?!?). Guiding their dragon stone placement strategically was a bit more challenging. Filling the tank with water was slow torture. They did redeem themselves on unpacking and sorting the plants by species.

2 pots of Bacopa lanigera went into the back-left corner, next to the filter, thermometer and heater. Two pots of Lysimachia nummularia ‘Aurea’ went in front of the Bacopa. To the right of the Bacopa, one pot of Limnophila sessiliflora and next to that the Cryptocoryne wendtii ‘Tropica’. Two pots of Lindernia rotundifolia went in between the Crypt and the right side of the tank. The Cryptocoryne sp. ‘Green Crisped Leaf’ took the spot on the right side of the tank, on the substrate slope between the front and the back.

60-litre-1I left them with a bucket, piece of hose, net, dechlorinator and a full test kit (ammonia, nitrite, nitrate, GH, KH and pH).