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Snail Control in the Planted Tank

By Mark Denaro

I’d rather spend time enjoying my tanks than cleaning them, so it is important to have an efficient crew of workers in each tank.  For planted tanks, I need a crew that will take care of any algae growth and something to ensure that the snail population doesn’t explode.

Keeping a cleanup crew in a planted tank make the aquarist’s job easier.

A lot of folks like to use snails for algae control but I’m just not in that habit.  Ramshorn and pond snails can breed at tremendous rates and mystery snails can eat leaves, so I gravitated to using various loricariid catfish for algae control.  Since pond and ramshorn snails tend to travel on Florida-grown plants, their introduction to a planted tank is almost inevitable.  In response, I also developed the habit of adding some type of botia loach that would eat the snails to every tank to keep them in check.

It should be noted that I’m using the term “botia” to represent the group.  Many of the fish that were classified in the genus Botia 20 years ago have since been moved into new genera, as the various subgenera have been raised to genus level.

I always try to size the botia to the tank.  While clown loaches are still the most popular of the botias, they’re not always the best choice for planted tanks.  They get rather large (up to 24 inches) and they can easily uproot plants as they grow.  As a consequence, I’ve tended to use some of the smaller species over the years and the yoyo loach  B. lohachata has become my favorite of that group.  It is attractive and particularly good at snail control,  but it grows to 5 inches so it’s still a little large for a lot of tanks.

As times and the availability of species changed over the years, I started adding Amano shrimp Caridinia japonica into my worker mix.  Unfortunately, many of the loaches would consider shrimp to be part of their diet, so adding the Amanos complicates the selection of a botia

Fortunately, dwarf botias Yasuhikotakia (Botia) sidthimunki, have become available in the aquarium trade again after a long absence.  This beautiful species is one of the best botias for planted aquariums.  It is a peaceful, active, diurnal species, so it has a big advantage over many of the other botias which are primarily nocturnal.  Y. sidthimunki grows to approximately 2 inches in length and consequently won’t uproot plants or pose any threat to adult shrimp.

The dwarf loach Yasuhikotakia sidthimunki tends not to bother shrimp.

Because the Amano shrimp larvae require a marine phase, their successful reproduction is not going to take place in a planted aquarium and we don’t have to worry about the dwarf loaches eating young shrimp. If you are using red crystal shrimp or any of the other species that reproduce in freshwater and want them to reproduce in your tank, you may not want to add any type of botia.

Amano shrimp consume algae and cannot reproduce successfully in freshwater, so their population will not go out of control.

Recent years have also seen the introduction of a number of interesting snails to the hobby.  Of particular interest to planted tank enthusiasts are the various members of the genus Neritina that can live in freshwater.  Similar to the Amano shrimp, these species require brackish or marine water for proper larval development and consequently cannot reproduce in the freshwater aquarium.  That fact, combined with their appetite for algae, makes them wonderful species to use as workers in planted tanks.  The botias will attack them in the same way that they will attack less desirable species, though, and this can present a challenge for the hobbyist.

If you want to use nerites but don’t want to risk population explosions of other snail species, it is important to treat every plant that goes into the tank with aluminum sulphate, potassium permanganate, or some other chemical that will kill not only snails but snail eggs that may be attached to the plants.  The aquarist must also remain ever vigilant in case any snails survive this process.  Any other snail species must be removed from the tank as soon as the hobbyist realizes that they are present.

Posted May 29th, 2015.

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Why Leiden Style?

By Mark Denaro

When I was asked to write a brief series of articles for the Adventures In Aquascaping column, I immediately knew that I wanted to create a Leiden style aquarium.  I have always found these tanks to be the most esthetically appealing planted aquariums and find it unfortunate that they have fallen somewhat out of favor with aquarists in the US.  Actually, I’m not sure that they’ve really fallen out of favor so much as gone unknown by folks who have entered the hobby in the last 12-15 years, as the Nature Aquarium designs have become so popular.

Although this tank has a heavy bioload, the plants act as natural filters that help keep the water quality high.

My approach to planted tanks has always been that of a fishkeeper rather than a planted tank purist.  While I believe that it is critical to the tank’s success to create a great aquascape with the plants along with driftwood and rocks, I always want to keep a full complement of fish as well.  As an example, I’ll tell you a bit about the tank pictured in the May issue, which had been set up for about 2 years when the picture was taken.

It is a 75-gallon acrylic tank (60 x 18 x 16 inches) that was lit by a 40 watt 10000K bulb, a 40 watt actinic bulb, four 27 watt 6700K CF bulbs, and 2 55 watt 10000K CF bulbs.  Obviously, that is a lot of light, especially for a tank that is only 16 inches tall.  The Egeria najas in that tank grew a minimum of 4 inches a day so the tank required pruning at least every other day.  The fitration was accomplished via an internal power filter that turned approximately 160 gallons per hour.

The fish community included large schools of cardinal tetras and narrow wedge rasboras Trigonostigma espei and smaller schools of marble hatchets, red phantom tetras, and checkerboard barbs.  There were also four marble angels, a pair of kribensis, three L177 plecos, two whiptails, and two farlowellas and I’m probably forgetting something.  All in all, there were approximately 125 fish in the tank.  In addition to the fish, there were about 30 Amano shrimp in the tank.  Now, that’s a very heavy bioload and a very small filter.  The key to making it work is the tremendous growth rate of the plants (the plants are the primary filter) combined with extremely careful feeding.

A tank set up at that stocking level is definitely not suitable for the beginning or intermediate hobbyist.  I’d been keeping planted tanks for around 25 years when I set that one up.  A few other things you should know about that tank are that it had laterite mixed with the gravel and that liquid plant fertilizers were added daily and plant tablets were added regularly.  I was living in Dayton at that time and the tank was set up with Dayton tap water, which is essentially liquid rock with a pH of around 8.4 and very high hardness.  CO2 was never used in that tank.  The hard water really adds a lot of minerals that the plants can utilize and makes a big difference.  There are very few plants that will not do well in hard water.  Just because a plant has evolved and grows in soft water doesn’t mean that it can’t take advantage of the extra minerals in harder water.  I did not use a substrate heater in that tank as the gravel was not deeper than 2 inches in any area so I didn’t think I needed one to keep it from going anaerobic.

Posted April 7th, 2010.

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