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Your digression is entirely welcome - although I did have a similar thread going which was related to this. The whole thing is removable but the problem is the opaque lids, which fit inside the tank - you can just make out the end of one of the rails in the top left of that picture - and sit...

quite...

You may well ask... So, the tank is sold as "125 litre" - first off, this corresponds to the maximum external dimensions, not the internal dimensions. Then, the included lighting system hangs down 7cm below the top of the tank, which limits the maximum height of the water. Once you've taken...

There are three 'modules', each containing an identical piece of blue foam. Each module has slots in the side so water comes in both from there and from the module below it. Then at the top there is a small, denser, piece of blue foam that's right under the pump inlet. It's not a great design...

You're right of course - I've posted so many pictures in other threads about this tank I forget that I need to put more up! It looks a bit brown in the second picture only because I removed the foil background sheet and the wall behind the tank happens to be painted brown. Also, only the rear...

...or am I doing something else wrong? My nominally 120 litre tank, with about 84 Litres in it, came with an Oase Bioplus Thermo 200 filter system. My tank is cycled and my water is clear. I've been changing about 30% - 40% of the water weekly. After I've rinsed out the filter sponges I have...

Just thought I'd post a final update to what was originally my first post. I was seriously regretting being talked into having this aquarium. The algae was out of control, fish had died, everything was up in the air and I had no idea what I was doing. Thanks to you guys, and some patience...

Not a question, more an observation. My school of 13 cardinal tetras crowd together in one corner of the tank and swim up and down. But here's the thing. They start doing this around 7pm every evening, and carry on for up to an hour, until the tanks lights turn off at 8pm. They never do it...

Hmmm. Assuming the same temp and surface area to volume, that sounds like about 6 litres a week in my tank. An answer, thanks!

Indeed. But that's quite a lot of money to do - ordering two custom cut pieces of safe-edge toughened glass

Yeah, I did think about that - ordering two pieces of custom size safe-edged glass.. Sadly, I no longer have cats since the last one died of old age. They (both siamese) would have loved this tank!

Thanks - yes I saw that thread and I'm aware of why distilled/demineralised water has to be use for top up. I'm trying to estimate how much water I'd have to have on hand if I was running lid-less, before I decide to try it.

The aquarium in question is an Oase StyleLine 125.

Sliding glass lids - but they're painted, not see through.

OK, but...

I'm contemplating throwing away the annoying lids that came with my aquarium. I know this will increase the evaporation to the point where I'll have to use distilled water to top up. So I'm wondering if anyone could give me a vague idea of how much topping up I might be doing - in terms of...

If this is your new tank, then it's fully non-cycled and unless you used the water from the old tank you're basically just measuring the tap water. The cycle is ammonia -> nitrite -> nitrate so (given you're putting the fish in straight away) in the early days it's the ammonia and nitrite you...

what a stunning tank Ellegatto...

I'm rooting for you! I'm a complete bloody novice myself but I can say you need to test for ammonia and nitrite. I was in a similar place to you - an empty tank and no time to get it right because I had a plastic box full of potentially dying fish. So you can't always follow the rules in an...

Isn't it possible to rig up some kind of lamp? A table lamp or a reading lamp maybe - that would put a (tiny) bit of heat into the water as well...

I'm in a semi-rural area (just south of Gatwick) so I imagine that would mean slightly higher nitrate due to the agriculture going on around me?

So it's all clear as mud then!

...and here's the tank water. It does look lighter, doesn't it? By the way and speaking of tap water, my water supplier's annual report says calcium=54 mg/l, calcium carbonate=134 mg/l. What does this mean in terms of the hardness of my water?

Now I'm completely confused and doubting my technique. Having followed the instructions carefully (complete with aching arm!) my tap water looks like about 10ppm I think. I'd better do the tank water again.

I will test the tap water and report. Actually I suspect that first reading was wrong due to poor technique. I just tested nitrate again, after the water change, and it's less than 10ppm for sure, maybe less than 5ppm. That's come down too much for 35% water change. It's an API kit, with two...

So I left things alone for a week, kept an eye on my water test results (all good and stable) and then this morning changed about 35% of the water with temperature-matched tap water dosed with Stress Coat. I scraped the crud off the filter sponges gently in used tank water while I rinsed the...

I've just read that honey gouramis should be in groups of at least four, which would be a bit of a stretch for my tank.

or what about Rainbow Dwarf Gourami - any thoughts?

...so roughly 15 litres of tank space per fish. I was looking at this: https://www.seriouslyfish.com/species/cleithracara-maronii/ which suggests a maximum length of 11cm and a recommended minimum tank floor dimension of 0.27 sq.m. Mine's about 0.25. I certainly like the idea of them -...

Hmm. Looks interesting. My tank size might be a bit marginal though, from what I'm reading