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Oh the plant is hygrophila possibly polysperma that’s gone a bit leggy. Trim and replant as suggested.

Certainly will be enough.

it might do, but you'll be better off with a small powerhead as you can move them around if you have a dead spot.
Like This the small one will do the job.

I'd start with giving the filter media a swish in old tank water as those APS filters are nowhere near the advertised LPH, you'd want the next one up for a 155L tank really.

you want to be doing 30L a week as depending on the catfish species, they tend to be pretty messy fish.

Arggghhh That be black beard algae!

Hydrogen peroxide syringed directly on it will kill it in no time.

It can, but you have nitrites, so the cycle hasn't slowed or come to a halt. It'll just need more ammonia dosing (at this stage, possibly every day), testing each day and waiting for the 0 ammonia and 0 nitrite to show.

cyanobacteria isn't an algae but bacteria. You can get stuff that treats it but It will keep coming back unless you get to the bottom of the cause. What is the filter in question and how big is the tank? Its not unusual for shops to sell a filter and say 'Its more than enough for that size tank' whe...

cyano for sure. Suck out as much as you can and try increasing the flow in the aquarium.

Your fishless cycling right? don't do a water change, just top up the ammonia and wait until the nitrites drop.

They’ll end up as free food for the residents so no need to do anything

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