Don't add food. You'll just end up polluting the tank. Foods only release ammonia when they decay, depending on the type of food and temperature and bacteria, it can be hours or days. The ammount release can not be control so it causes an endless loop of mini cycles. I think you get the idea here.
Tetras are ok. But you would be much better of with scavengers (also call clean up crew) like dwarf shrimps (Red Cherry shrimps).
Things you should be doing now if you haven't already done so:
- Start doing regular water change now. Depending on your climate and surounding, sitting water can shift in pH in a month. Don't know why, it just does. Plants, driftwood and subtrate are probably the major factor here.
- keep you temperature at the zebra pleco confort level now. Again, temperature shifts can change things in your tank.
The big question is: "Do you have any experience raising pleco fry?"
I've seen all too often people losing an entire colony due to inexperience. Even though zebra plecos are pretty hardy and at 1/2 year or 1", they "just" got off the safe zone. You must take care not to make stupid mistakes or over do things. The best way to raise them, is to set up a good schedule and keep to the schedule. Ie., feeding amount, timely water change regiment.
Make minor adjustment if you want. But always minor change.
Check up on them once or twice a day. *Spouse jealous warming here* so don't make it too obvious
Things you don't do:
- don't put 2 heaters in there. But instead, have a good digital thermometer and a spare heater stash away. And read it when you do your checking.
- don't use any kind of automatic feeding devise. (you've been warned)
- don't blow your power head at them 24 hrs a day. There is a reason why they have caves or hide in cracks and crevices. It's because they want to get away from the currents to rest and sleep and breed. They like the current, but not 7-24.
im serious as well.