Silver dollar Gender & breeding

[Dragonfly_M3]

If the tank is ~35gal, you are way overstocked IMHO, even if it is just the SDs. And then you have a cichlid (looks young, so still growing?), some catfish and a couple of barbs. Too much

hmm, maybe not more SDs then lol. i plan to remove the ciclid and catfish to a pond when they grow larger too.

I only feed 3-4 days per week, but on the days I don't feed, I hang pieces of nori sheets from clips in the morning, which are eaten within seconds. The actual feeding I give is a rotation of a long list of items, and on each day they get a bit of 2-3 of the list below, and I keep rotating:
Nori sheets; duckweed (live, always present within floating corral at surface); unsalted roasted sunflower seeds; garbanzos & guandules; cucumber; lettuce (rarely anymore); crushed dried insects (mainly crickets and mealworms); flake food (spirulina, multiworm, bloodworm); pellets (I have 10 different kinds, both insect/worm-based and veggie-based); live earthworms; frozen cubes (mysids, bloodworm, brine shrimp); Repashy Igapo (insect based).

right ill try some of those two now and then too.

and, thanks a lot for your help and time, appreciate it

 

[fishguy1978]

I agree with F FJB that they are female M. Altodorsalis and that 35g is way to small for those fish. I have a mixed species school of $22. There are Metynnis Altodorsalis, Hypsauchen and lippincotianus and Myloplus Rubripinnis. They are housed in a 260g (84x30x24) tank.
The Rubripinnis (all females) will be the largest eventually and should be near 11in.

 

[Marximus]

Hi again - I believe you have females of Metynnis altidorsalis.
So what size are they now?, and what size is your tank?
From the photos I guessed they were between 4-5 inches. Is that correct? Perhaps I over estimated. If they are smaller than that, then yes, they may grow a bit more.
Both M. altidorsalis and M. argenteus grow to about 6 inches, typically not more, and most frequently a tad below; M. maculatus about the same; M. lippincotianus (the most common spotted dollar in the market, and not what you have) stay smaller around the 4-5" mark. Other species, mainly of other genera of "silver dollars" do get much larger, even dinner plate size. But not these guys. Final size in aquaria depends on age, tank size and conditions (water quality long term, diet, and social behavior within their groups).

Unfortunately, the term "common silver dollars" is not useful or informative, and several species look very similar. Just referring to species of Metynnis (the smaller dollars), there are 12+ recognized species, but only 4-5 are seen in the hobby in the USA with any frequency. So what is a common dollar is anybody's guess, unless pictures are provided. LFSs use common names very loosely, so not reliable either.

You have a very nice group of fish, and they look healthy. How long have you had them? What are you feeding them? They should eat anything thrown at them, but thrive on a varied diet including plant matter, grains/seeds, and some insects and worms. Pellets, flakes, raw veggies, live/frozen bugs, all presentations work and for mine I find best to use all presentations.
Not having males is not necessarily a bad thing as sometimes they can be quite aggressive towards each other, trying to compete for females; this is rarely seen among females. Although various people have been able to breed then in aquaria, this is not common, and the likelihood of happening is relatively low anyways. So, as you say, you may be better off with the ladies.
Good luck!
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Don’t silver dollars eat plants? Always wanted them but I got planted tanks

 

[fishguy1978]

Don’t silver dollars eat plants? Always wanted them but I got planted tanks

Yes, almost always. Unless you are F FJB who has a mystical touch and can do both.