Aquarium Care and EcoBio-Block

by Ruby Bayan

Community Fish Tank

Here’s a candid question from my friend Bob: “I just got a 20-gallon tank and was thinking about putting in about a dozen Neon Tetras, six to eight Mollies, a Plecostomus and perhaps introducing two to three Angelfish afterwards. Is this an acceptable plan?”

My answer was, “Bob, you’re inviting disaster into your aquarium! You will be defying at least four major guidelines in the book of ‘good fishkeeping’!”

Defiance 1: “The one-inch-per-gallon rule is baloney!”

Although not a strict rule, the one-inch-of-fish-per-gallon-of-water guideline is often a takeoff point for fishkeeping hobbyists aspiring for a stable bioload. However, factors like efficient filtration, fast-growing fishes, and aggressive or territorial breeds totally overhaul this “rule” giving rise to setups with more than one inch of fish per gallon, or with just a pair of two-inch fish for a 25-gallon tank.

In Bob’s planned 20-gallon setup, 12 Neons, 8 Mollies, 1 Pleco, and 3 Angels, even if they’re all less than an inch each, will surely overload his tank habitat, no matter how efficient his filtration is. But let’s say that on top of a truly efficient filter, he can be diligent enough to make regular water changes, his next problem will be what water parameters to maintain.

Defiance 2: “What natural habitat? I’ll give them their natural habitat!”

One of the primary objectives of fishkeepers is to provide a habitat that is closest to what the fishes have in the wild. The community that Bob is looking at putting together cannot occur naturally because the fishes he has chosen do not thrive in the same water conditions.

Although all the chosen fishes can be made accustomed to a common water temperature (around 77 degrees F), Neons prefer water that is slightly soft, with pH between 5.0 and 7.0. Mollies, on the other hand, live in slightly hard water with pH of 7.5 to 8.5.

In other words, either the Neons or the Mollies will suffer stress and eventually fall ill if brought together in one community tank because the water composition is outside the range ideal for them.

So, if Bob removes the Mollies from the equation and maintains a water composition ideal for the rest of the fishes, will the Neons, Pleco, and Angelfish be fine together? The answer is, again, “no.”

Defiance 3: “They don’t look aggressive to me!”

Angelfishes belong to the notoriously cranky group of cichlids. Highly territorial and potentially aggressive, Angels (an oxymoron?) are known to be “stealth” attackers. Swimming casually and almost in a delicately gentle manner, they can snap at a prey in a flash and swallow whatever fits their mouths. Full-grown Angels are known to feast on Neons.

So, maybe Bob can chuck the idea of adding Angels later on. Will his tank be safe now with the dozen Neons and one Plecostomus? Unfortunately, the Pleco may pose a whole new problem.

Defiance 4: “They’re just sooo cute!”

The Plecostomus is one of the fastest growing catfishes in captivity. A “cute” three-inch Pleco can double in length in six months and grow to a “horrendous” adult size of close to two feet in a couple of years. Their phenomenal growth is accompanied by their equally phenomenal rate of excretion that can easily overwork standard filtration systems. A Pleco will, therefore, be okay in a 20-gallon tank only in its first few months as a juvenile.

In other words, Bob’s 20-gallon tank is down to just a dozen Neons. That’s no fun, right? Well, a 20-gallon tank can’t really support a lot of fishes, and frankly, losing some to not having an acceptable plan is my definition of “no fun.”
Bob can still have a fun tank by choosing a combination of community fishes that are attractive together and thrive in a habitat that will remain stable indefinitely.

Here’s one suggestion: to join his Neons, he can add a pair of Rams (Ramirezis may be cichlids but they’re one of the more sedate ones), and instead of the Pleco he can choose a pair of Corys (corydoras) or Otos (otocinclus) that remain small even as adults.

Add to that some diligent monitoring, regular water changes (or better yet, an EcoBio-Block that conditions water so that changes are hardly necessary), and efficient equipment, and Bob can be well on his way to implementing a truly acceptable plan.

When you are ready to purchase your first aquarium, one of the first things you learn is how to properly cycle the aquarium and how to slowly introduce new fish to avoid ammonia spikes while the colonies of beneficial bacteria are developing. That’s easy enough to follow — but what about when you have to move an existing community of fish to a new home? Maybe you moved and have to re-establish the aquarium, maybe you’re moving to a larger or even a smaller tank; whatever the reason, there are ways to safely move the fish without as much risk of ammonia spikes.

A properly cycled tank contains a healthy colony of bacteria that breaks down ammonia from a fish’s waste and uneaten food into nitrites and then into nitrates. In a healthy tank, there should be 0 ammonia, 0 nitrites and less than 40ppm nitrates (20ppm if you have invertebrates such as snails or shrimp). Without sufficient amounts of beneficial bacteria, ammonia and nitrite in the water may be fatal to fish.

Beneficial bacteria live all through the water and on every underwater surface in the aquarium, but the water itself carries a very low concentration of bacteria so it’s not very effective to simply transfer water from the old aquarium to the new in order to maintain bacteria levels. Ideally, you will be able to transfer some old filter media to the new aquarium, or even a handful of gravel or fake plants that will all have beneficial bacteria on them. Make sure that the materials of your choice stay wet with tank water until they can be placed in the new aquarium.

Alternatively, if you have EcoBio-Block in your aquarium, that will be sufficient to switch over to the new one. EcoBio-Block has a lot of beneficial bacteria living in its volcanic rock and has quite a bit of surface area so a lot of additional bacteria get transferred over from the established tank. It is not necessary to keep EcoBio-Block wet, but it may help eliminate any minor ammonia spikes that may occur after the transfer as there will be more active bacteria immediately if kept wet. EcoBio-Block will also allow you to wait a little bit longer before doing the first water change as it provides essential minerals that would otherwise have to be replenished through water changes, giving the fish extra time to de-stress after a big move without being bothered.

Make sure not to put whatever bacteria-containing materials you’ve chosen into the new aquarium until a de-chlorinator has been used in the water as chlorine will kill the bacteria. Keep close tabs on the water parameters for the first week after the transfer, doing minor water changes as needed to compensate for any ammonia in the system that may not be compensated for by the bacteria yet. Watch the fish closely for any clamped fins or red, puffy gills as these may be signs that the water parameters are off. If these simple guidelines are followed your fish should have a relatively effortless and healthy move.