Looks like Synodontis lucipinnis to me. They do best in a group of their own kind.

It should be, on paper, but I gather the APS filters don't have the output of equivalents by more established names like Eheim and Fluval. If you doubt it would be sufficient then maybe go for the 1400.

Hi

The APS 1000 is approx 39 cm tall, the 1400 is 43 cm and the 2000 is 49cm. I would rule out the 2000 as it would be too tight a squeeze, but either of the others is doable, though for ease of access probably the 1000 is the easiest. When you get it, add the media from your internal into it if you're intending to stop using the internal as that will maintain your cycle.

The three of them should be OK in that tank, especially as they have always been together.

I have not heard of using Vitamin C powder as a dechlorinator so can't comment on safety/dosage.

Most shop-bought dechlorinators use Sodium Thiosulphate so the best thing is to use one of those. If you're cost-conscious, try Seachem Safe, a powdered form of Prime which is used in tiny quantities and very economical to use.

It's the male that guards the eggs, so chances are you have a pair and the eggs are viable.

He does appear to have dropsy, although I can't tell if he's pineconing as the pic is blurry. You can try treating with Esha 2000, which I've had some success with for dropsy.

I doubt you'll get a reply as this topic was started 12 years ago and has long since been abandoned.

In a tank so small you're really limited to a Betta I'm afraid.

Here's an article on fishless cycling: https://www.fishkeeping.co.uk/articles ... hless-cycling-article.htm

I did a search and found this, but it's not cheap: https://www.koilogic.co.uk/et-air-pump-alarm/p1470

25% water change and gravel vacuuming weekly and glass cleaning as needed.