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Can’t be certain with the first two pictures, but #3 is a female and #4 is a male.

The dorsal fins of males are mostly yellow; female’s dorsals are edged with orange. Females also have a plumper body and grow larger.

I keep a good-sized clumpJava moss in my fry tanks, which provides micro fauna for the babies to snack on.

90% certain the first fish is a male, #2 is definitely a female, so yes, they’re most likely a pair.

I’d say they’re the Nigeria yellow form of P. taeniatus.

Fully grown Congos can easily swallow CPDs and emerald dwarf rasboras. Nematobrycon species would make much better tankmates.

It’s definitely a female Trichogaster labiosa, or thick-lipped gourami. It’s the line-bred red morph; the wild type is almost never seen in shops. It’s not a hybrid. I’ve never seen a labiosa x chuna cross in all my decades in the hobby.

Grindal worms are very easy to culture and most fish go absolutely insane for them.

It’s a male Apistogramma hongsloi.

I highly recommend Dicrossus maculatus, the Spade-tailed Checkerboard Cichlid, if you’re able to get a hold of them. They’re very inquisitive and are always out and about exploring their surroundings. I kept and bred mine in a 20 high, although I did have to remove the fry to another tank in...

Odessa barbs are extremely active and can be rowdy. It won’t make a difference if you keep them in larger numbers. Snakeskin or six- banded barbs would be better companions for pearl gouramis.

Fry can find microfauna in water sprite and Java moss. My Betta smaragdina fry found enough infusoria in these plants until they were large enough to take BBS.

I had a group of them many years ago. Beautiful, bulletproof fish, much nicer than the gold form, which IMHO is kind of blah. It’s getting difficult to find wild-type ANYTHING these days, which is a pity.

The Wet Spot in Portland OR has them.

It’s a mature male Bedotia madagascarensis, the usual species found in shops. They’re usually sold when they’re much smaller.

Females are quite a bit larger than males when fully grown.

The big box stores devote 6 or more tanks to various types of glofish, leaving little room for less common species. Unfortunately, consumers can’t seem to get enough of these abominations. And don’t get me started on “balloon“ fish!

Hard to tell from the photo, but the stocky body shape makes me think that it’s a female.

Your peacock gudgeon is definitely a female.

I have a very beat-up copy of the 19th edition that I purchased back in 1978. It’s the only one of my many aquarium books that includes the pronunciation of scientific names.

It’s a symptom of extreme old age. 5 years is ancient for a pearl danio.

You have two different species. The red one looks like a female red morph thicklip gourami and the yellow one is a male gold honey gourami

I have six female honey gouramis available. They’re the brown wild type, not the gold variety. I bought a group, hoping for both sexes, but they all turned out to be girls. I’m willing to ship.

They didn’t seem cramped until their offspring started growing up, which I later sold. Betta smaragdina, and for that matter, B splendens, feel more secure in smaller, shallow, densely planted tanks with gentle water movement.

I kept a pair of Betta smaragdina in a heavily planted 5.5 gallon without any problems. They even spawned numerous times, the young growing up with their parents. They’re lovely fish - it’s a shame they’re not more readily available.

Hi! I got my first solo aquarium way back in 1976 and I’m still very active in the hobby. Along the way I’ve made many mistakes and learned some valuable lessons. I’m still learning and willing to share the knowledge I’ve accumulated over my MANY years as an aquarist.