Your tank looks really good so far.
The baby isn't THAT small. It's a decent size juvenile probably 2.5cm-3.0cm. As long as the jv-betta doesn't get too nosy around feeding time, it should be fine.
- As for the floating plants.... just "anchor" the roots to the rocks in the front BEFORE you bury them into the Eco-C. You can figure out which rock is appropriate to use based on the size of the plant & the root system.
- Once "weighted" the floaters, shouldn't get dislodged again. This is why the places that SELL the plants, put the flexible lead weights on them to keep them neat & tidy.
Whenever I "start out" with a set of plants in a brand new/tank in cycle, I will program the lights to remain on for 14-16 hours/every day for the first 2 weeks, then after that I reduce it to 10-12 hours maybe less depending on the plant growth or algae issues that may pop up.
Any algae outbreak issues can easily be taken care of by introducing a QTed clean up crew of snails/inverts/ottos around week 4-5 of the tank in about 48 hours.
Noticed in the veggie video, the zucchini slice in the Nemo clip is about 6x-8x as THICK as the slices I offer my fish. The thinner the z-slice, the easier the fish can tear off a portion & make use of it as food.
Remove the center portion of the z-slice with the seeds, because they can't EAT it. Save it for yourself or your curious dog.
- It's always better to feed the fish LESS than TOO MUCH.
- If there's any blanched veggies left over in the morning, reduce the amount or thin out the slice, blanch it longer.
- That's why I use paper THIN slices, 10-15 seconds in boiling water & it's done.
Think there's also a onion plant (Crinum thaianum) or aponogeton bulb floating on the surface, that might be dried out/rotten. Check it out.