why are my plants so small

What are your lights? (your plants look healthy, so I think it's the lights)

Can you replace the tin foil with mylar?

You need better lighting, what is the room temp?

Firsttimehydrogrower: How old are your babies? You seem to be doing everything right, but you're growing an unknown strain in a miniature table top growing system so it stands to reason you won't be getting 'red woods size plants.' Be grateful that your plants look healthy. I hope you have a seven holes "Classic model" or better. I would suggest that if you have the three lamp hood on your A/G with the 24" arm/light stand, and you keep the lights 1" to 2" above the tops of your plants as recommended by A/G, they'll get bigger. There's nothing wrong with A/G's lights. What light schedule are you using? Tomatoes? That's the 18/6 schedule and probably the best for what we're growing.

You might want to consider some aimed Mylar covered reflectors to recycle the dissipating light you already paid for back up to the lower portions of your plants that will soon be shaded. If you bought a two lamp, six hole 'Space Saver' A/G model unfortunately you didn't do your homework and you got what you paid for. I hope that helps. If all else is well, patience grasshopper. HSA

Ditch the foil and go with Mylar. If that is not an options flat white is good. Get more Light

they look sstreched lower the light or replace with a stronger one

.... with my first grow... I had the same issues.... the plants were really small even after 2 months....

then I switched from CFLS to a 600W HPS light.....

WOW those babies Started to GROW!

Ok well irs probably my lights. They better be healthy I treat them like a part of my family lol. I have 2 lights on them right now. A 2ft/24w and a 4ft/54w. I need a new light but money is very tight as of late. Thanks for the help. Replaced my lights to under 4" and noticed a difference.

Oh also my lights are made by sunblaze. Got them at my local hydro store