Question 1

How many small marine fish can be kept in here? Any advice most welcome

Accepted Answer

None - a marine tank requires far more than this product offers such as sumps, UV filters etc - this would not be suitable as it's too small. A marine tank needs to have far superior filtration than this product & water stability. A 10ltr tank would not provide the stability that they would need to survive regarding bacteria & temperature.
Even the temperature of your house would affect the temperature of the water in a tank this size & even a few degrees variance would be enough to distress or kill Marine fish. 
A Marine tank needs to be ideally a minimum of 100 litres upwards if you don't want to be spending £100's on fish every week when they keep dying - and if you have that much money to throw around then you can provide better than this for a Marine setup. If you want to keep marine fish do your research - don't buy a 10ltr cheap tank like this, as Marine fish need specialist care. 
This tank is barely big enough for cold-water fish let alone marine.

Question 2

I have looked at picture some of you have put on and the pump in them is not under the water the water level is below where the water flows from

Accepted Answer

The pump/filter is housed inside the white cylinder as are the lights. The out flow is at the top of the cylinder just below where it sticks out over the tank (this is where the lights are).  Hope this helps. It is a nice tank but small and only suitable for certain fish.

Question 3

Can recommend a good heater to go with this tank?

Accepted Answer

I have the 20w slimline heater from aqua one. Any 10w heater would be fine. You can put the slimline heater next to the filter and due to the curvature of the tank it’s completely invisible. I do not recommend putting the heater in the filter compartment as the filtration using those slides it’s pants . I would use that space in the filter for Seachem Matrix or other small porus filter media. I use the one slide as a divider ripped off the floss etc so it’s just the plastic then I keep the one slide closest to the output as is replacing it every month for fine filtration and carbon. This will make the filter 200x for effective.

Question 4

What are the measurements?

Accepted Answer

the aquarium has the shape of a cylinder and the measures are: 25cms high, 25cms wide and 25cms deep.

ASIN	B07J5RGCRC
Best Sellers Rank	47,063 in Pet Supplies ( See Top 100 in Pet Supplies ) 72 in Aquariums
Brand Name	Marina
Colour	Blue,Green,Red
Customer Reviews	4.0 4.0 out of 5 stars (2,804)
Global Trade Identification Number	00015561128520
Included Components	Water Circulation Pump, Filtration System, LED Lighting
Item Dimensions L x W x H	25.4L x 25.4W x 31.5H centimetres
Item Shape	Round
Item Type Name	Marina 360 Aquarium
Item Weight	2.36 Kilograms
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	12852
Material Type	Plastic
Model Number	12852
Number of Items	1
Number of Packs	1
Pet Type	Fish
Product Style	Aquarium with Remote Control LED Lighting
Product Warranty	2
Set Name	Marina 360 Degrees Aquarium Complete Set
Special Features	Remote Control LED Lighting, Integrated filtration system
Specific Uses For Product	Indoor
Tank Volume	10 Litres
Target Species	Fish
UPC	015561128520
Unit Count	1 Count
Vivarium Type	Aquarium

Marina 360 Aquarium with Remote Control LED Lighting, Multi-colour, 10 Litre,Blue,Green,Red

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