You can get a small filter or just do daily - every other day pwc
. Anyway because it isn't cycled.you need to do very frequent pwc
anyhow. You can suction the water with a smaller diameter plastic hose and use a little Fluval Edge pre filter sponge rubber banded or zip tied on to the end of the suction. And a turkey baster to quick clean poops or excess food. You should consider just bare bottom for cleaning with a few stones, a chunk of wood and some plants from your other tank. It will give the babies something to nibble at.