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I don't think that the tube will last longer just because it is over-size for your tank. It still is emitting at full strength. Still $22 is not a lot if it provides peace of mind.
Still too small for me to accurately sex. If they are yours, give them some time to grow up and sex out. If you want to buy a pair from juvenile stock you could do as I do. I buy 6 or more juveniles. Statistically you will get a 96% guarantee of at least one of each sex - if the original pool of...
If UV works for you, then keep it going. I personally will continue using my old tried and true quarantine method - at least 6 weeks no matter how they appear and from whom ever they come. A lot less expensive.
If one covers their tank top Pistia doesn't grow well. It doesn't like water on the surface of it leaves (cover pushes leave lower into the water) or water dripping on to the leaves. It grows best in open-top tanks.
It seem a bit bright to me. I would add some floating plants if it were my tank. Then again, give it a few months and the Pistia in it will cover the entire surface.
If the tank that they are in is large enough, I would keep the all together and let them choose their mate. It will form a stronger, more compatible, pair. Once you see a pair form either move them to another tank or remove the other fish.
What MacZ wrote is true for apistos in general, but not for cichlasomines like your I. bimaculata. They do form pair bonds and both parents are active in the care of the fry.
... and the stress on a female trying to protect her brood from all those Neons is incredible. I hope for your sake and that of the fish that the apistos are the same sex, preferably males.
The first photo probably shows a male, too, but not positive. It also seems to be a different form/species in the hongsloi-complex, but again I'm not sure. That is the problem with photos of fish showing different positions and lighting.
I haven't seen the Rainbow Ram strain/population since the 1970s. They ruined my desire for other strains out there ... well maybe some wild populations.